Other — Synthesis, conductivity, and electromagnetic wave absorption properties of chiral poly Schiff bases and their silver complexes

19 measurement groups · 98 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Complex 1a pressed tablet / dried black powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
elemental Ag found	Ag 32.23%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
specific optical rotation [alpha]D20	722	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	3147	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	3520	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.12	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1568 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	51%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Complex 1b pressed tablet / dried black powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
elemental Ag found	Ag 32.31%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
specific optical rotation [alpha]D20	0	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	3437	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	3677	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.07	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1568 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	54%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Complex 2a pressed tablet / dried black powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
elemental Ag found	Ag 25.8%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
specific optical rotation [alpha]D20	666	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	3512	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	3892	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.13	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1591 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	61%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Complex 3a pressed tablet / dried brown powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
elemental Ag found	Ag 25.29%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
specific optical rotation [alpha]D20	1500	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	3410	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	3621	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.06	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1587 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	57%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Complex 4a pressed tablet / dried black powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
elemental Ag found	Ag 35.64%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
specific optical rotation [alpha]D20	875	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	7134	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	7633	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.07	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1585 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	59%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Polymer 1 pressed tablet / dried gray powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
specific optical rotation [alpha]D20	1214	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
number-average molecular weight Mn	2539	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
weight-average molecular weight Mw	2762	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
GPC dispersity PDI	1.09	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
IR C=N stretching band	1577 cm^-1	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	2 · Experimental - synthesis characterisation
isolated yield	75%	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Polymer 2 pressed tablet / dried brown powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
specific optical rotation [alpha]D20	1500	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
number-average molecular weight Mn	2823	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
weight-average molecular weight Mw	3155	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
GPC dispersity PDI	1.11	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
IR C=N stretching band	1596 cm^-1	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	2 · Experimental - synthesis characterisation
isolated yield	89%	—	—	Text Exact Reported	2 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Polymer 3 pressed tablet / dried buff powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
specific optical rotation [alpha]D20	1400	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	2650	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	2724	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.03	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1595 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	56%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Melting point, optical rotation in DMF, FT-IR with KBr pellets, elemental analysis, and GPC with THF solvent.

Infrared spectroscopy Bulk elemental and compositional analysis

Polymer 4 pressed tablet / dried gray powder · Pellet

Analytical characterisation of dried polymer/complex sample; optical rotation concentration as reported per compound.

Context: neat polymer or neat silver complex
Measurement source: 2-3 · Experimental - Measurements and synthesis characterisation

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
specific optical rotation [alpha]D20	1090	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
number-average molecular weight Mn	5571	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
weight-average molecular weight Mw	5933	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
GPC dispersity PDI	1.06	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
IR C=N stretching band	1596 cm^-1	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation
melting point lower bound	>300 deg C	—	—	Text Approximate	3 · Experimental - synthesis characterisation
isolated yield	48%	—	—	Text Exact Reported	3 · Experimental - synthesis characterisation

Complex permittivity and permeability measured with HP8722ES vector network tester; dielectric and magnetic loss tangents calculated.

Complex 1a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; complex/paraffin mass ratio 7:3; toroidal sample outer diameter 7.00 mm, inner diameter 3.00 mm, thickness 2.00 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: toroidal paraffin-composite microwave sample
Context: complex/paraffin composite measurement used to evaluate neat complex absorber behaviour
Measurement source: 2 · Measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
epsilon double-prime upper value	0.39 to 9.54	—	—	Text Range	6 · Electromagnetic Parameter Analysis · Figure 3
epsilon double-prime lower value	0.39 to 9.54	—	—	Text Range	6 · Electromagnetic Parameter Analysis · Figure 3
epsilon prime approximately steady value	around 20	—	—	Text Approximate	6 · Electromagnetic Parameter Analysis · Figure 3
maximum dielectric loss tangent	0.49 at 17.0 GHz	—	—	Text Exact Reported	7 · Electromagnetic Parameter Analysis · Figure 4
frequency of maximum dielectric loss tangent	17.0 GHz	—	—	Text Exact Reported	7 · Electromagnetic Parameter Analysis · Figure 4
magnetic loss tangent high-frequency value	rises to 0.46	—	—	Text Approximate	7 · Electromagnetic Parameter Analysis · Figure 4
magnetic loss tangent initial value	decreases from 0.53	—	—	Text Approximate	7 · Electromagnetic Parameter Analysis · Figure 4

Complex permittivity and permeability measured with HP8722ES vector network tester; dielectric and magnetic loss tangents calculated.

Complex 1b / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; complex/paraffin mass ratio 7:3; toroidal sample outer diameter 7.00 mm, inner diameter 3.00 mm, thickness 2.00 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: toroidal paraffin-composite microwave sample
Context: complex/paraffin composite measurement used to evaluate neat complex absorber behaviour
Measurement source: 2 · Measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source

Complex permittivity and permeability measured with HP8722ES vector network tester; dielectric and magnetic loss tangents calculated.

Complex 2a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; complex/paraffin mass ratio 7:3; toroidal sample outer diameter 7.00 mm, inner diameter 3.00 mm, thickness 2.00 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: toroidal paraffin-composite microwave sample
Context: complex/paraffin composite measurement used to evaluate neat complex absorber behaviour
Measurement source: 2 · Measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
maximum epsilon double-prime	0.31	—	—	Text Exact Reported	6 · Electromagnetic Parameter Analysis · Figure 3
maximum epsilon prime	3.18	—	—	Text Exact Reported	6 · Electromagnetic Parameter Analysis · Figure 3

Complex permittivity and permeability measured with HP8722ES vector network tester; dielectric and magnetic loss tangents calculated.

Complex 3a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; complex/paraffin mass ratio 7:3; toroidal sample outer diameter 7.00 mm, inner diameter 3.00 mm, thickness 2.00 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: toroidal paraffin-composite microwave sample
Context: complex/paraffin composite measurement used to evaluate neat complex absorber behaviour
Measurement source: 2 · Measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
epsilon double-prime upper value	13.33-24.95	—	—	Text Range	6 · Electromagnetic Parameter Analysis · Figure 3
epsilon double-prime lower value	13.33-24.95	—	—	Text Range	6 · Electromagnetic Parameter Analysis · Figure 3
epsilon prime upper value	8.64-35.37	—	—	Text Range	6 · Electromagnetic Parameter Analysis · Figure 3
epsilon prime lower value	8.64-35.37	—	—	Text Range	6 · Electromagnetic Parameter Analysis · Figure 3

Complex permittivity and permeability measured with HP8722ES vector network tester; dielectric and magnetic loss tangents calculated.

Complex 4a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; complex/paraffin mass ratio 7:3; toroidal sample outer diameter 7.00 mm, inner diameter 3.00 mm, thickness 2.00 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: toroidal paraffin-composite microwave sample
Context: complex/paraffin composite measurement used to evaluate neat complex absorber behaviour
Measurement source: 2 · Measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
maximum epsilon double-prime	203.63	—	—	Text Exact Reported	6 · Electromagnetic Parameter Analysis · Figure 3
maximum epsilon prime	134.96	—	—	Text Exact Reported	6 · Electromagnetic Parameter Analysis · Figure 3
dielectric loss tangent at 13.5 GHz	11.50 at 13.5 GHz	—	—	Text Exact Reported	7 · Electromagnetic Parameter Analysis · Figure 4
dielectric loss tangent at 1.0 GHz	11.07 at 1.0 GHz	—	—	Text Exact Reported	7 · Electromagnetic Parameter Analysis · Figure 4

Reflection loss calculated from measured complex permittivity/permeability using transmission-line theory.

Complex 1a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; calculated absorber layer thicknesses 1-5 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: calculated coating backed by measured toroidal paraffin-composite EM parameters
Context: complex/paraffin composite measurement; calculated absorber performance
Measurement source: 7 · Electromagnetic Wave Absorption Performance · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
frequency at minimum reflection loss	10.7 GHz	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5b
minimum reflection lossMarked as a best value within this paper	-45.9 dB at 10.7 GHz, 5 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5b
coating thickness at minimum reflection loss	5 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5b

Reflection loss calculated from measured complex permittivity/permeability using transmission-line theory.

Complex 1b / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; calculated absorber layer thicknesses 1-5 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: calculated coating backed by measured toroidal paraffin-composite EM parameters
Context: complex/paraffin composite measurement; calculated absorber performance
Measurement source: 7 · Electromagnetic Wave Absorption Performance · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
frequency at minimum reflection loss	15.6 GHz	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5a
minimum reflection loss	-20.1 dB at 15.6 GHz, 5 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5a
coating thickness at minimum reflection loss	5 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5a

Reflection loss calculated from measured complex permittivity/permeability using transmission-line theory.

Complex 2a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; calculated absorber layer thicknesses 1-5 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: calculated coating backed by measured toroidal paraffin-composite EM parameters
Context: complex/paraffin composite measurement; calculated absorber performance
Measurement source: 7 · Electromagnetic Wave Absorption Performance · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
strongest reflection loss	-3.6 dB at 5.0 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5c
coating thickness at strongest reflection loss	5.0 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5c

Reflection loss calculated from measured complex permittivity/permeability using transmission-line theory.

Complex 3a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; calculated absorber layer thicknesses 1-5 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: calculated coating backed by measured toroidal paraffin-composite EM parameters
Context: complex/paraffin composite measurement; calculated absorber performance
Measurement source: 7 · Electromagnetic Wave Absorption Performance · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
frequency at strongest reflection loss	4.91 GHz	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5d
strongest reflection loss	-6.9 dB at 3 mm, 4.91 GHz	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5d
coating thickness at strongest reflection loss	3 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5d

Reflection loss calculated from measured complex permittivity/permeability using transmission-line theory.

Complex 4a / paraffin toroidal microwave sample · Pellet

Frequency range 1-18 GHz; calculated absorber layer thicknesses 1-5 mm.

Temperature: room temperature/not specified
Atmosphere: not specified
Geometry: calculated coating backed by measured toroidal paraffin-composite EM parameters
Context: complex/paraffin composite measurement; calculated absorber performance
Measurement source: 7 · Electromagnetic Wave Absorption Performance · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
strongest reflection loss	-1.9 dB at 1.0 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5e
coating thickness at strongest reflection loss	1.0 mm	—	—	Text Exact Reported	7 · Electromagnetic Wave Absorption Performance · Figure 5e