Electrical Transport — Control of crystalline proton-conducting pathways by water-induced transformations of hydrogen-bonding networks in a metal-organic framework

3 measurement groups · 7 results

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

ac impedance using sealed cell under helium at 0% RH

Impedance spectroscopy

pressed pellet of anhydrate 1 · Pellet

pellet of 1 prepared by heating pellet of 1·2H2O under vacuum; measured under helium condition for 0% RH

Temperature: 298
Atmosphere: helium, 0% RH
Geometry: pressed powder pellet with gold electrodes
Context: pristine anhydrate MOF pellet
Measurement source: 7702 · Physical Measurements · Figure S2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity of anhydrate 1 at 25 °C	~10^-12 S cm^-1	1e-10 S m^-1	~	Text Approximate	7705 · Proton Conduction · Figure 7; Figure S2

ac impedance using Solartron SI 1260/1296 and Agilent 4294A; quasi-four-probe pellet with gold electrodes

Electrical conductivity Impedance spectroscopy

pressed pellets of hydrated 1·nH2O · Pellet

frequency range 1 Hz to 100 MHz; RH controlled from 40 to 98% in incubator; bulk conductivity estimated by semicircle fittings of Nyquist plots

Temperature: 298
Atmosphere: controlled relative humidity, 40-98% RH
Geometry: pressed powder pellet with two gold electrodes attached to both ends forming four end terminals
Context: pristine MOF pellet with humidity-controlled hydration
Measurement source: 7702 · Physical Measurements · Figure 7; Figures S2-S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity of 1·2H2O at 25 °C	~7 x 10^-5 S cm^-1	0.007 S m^-1	~	Text Approximate	7705 · Proton Conduction · Figure 7; Figure S3
proton conductivity of 1·3H2O at 25 °CMarked as a best value within this paper	8 x 10^-3 S cm^-1	0.8 S m^-1	—	Text Rounded Reported	7705 · Proton Conduction · Figure 7; Figure S3
humidity-controlled conductivity range	10^-12 to 10^-2 S cm^-1	—	range	Text Range	7705 · Proton Conduction · Figure 7

microwave conductivity by cavity perturbation technique

Electrical conductivity

as-synthesised 1·3H2O crystals · Single Crystal

single crystal mounted on quartz rod in oxygen-free copper cylindrical TE011 cavity at 16.3 GHz; electric field parallel to 2-D layer; sample coated with paraffin to avoid dehydration

Temperature: variable, about 100-290 K
Atmosphere: paraffin-coated sample; dehydrated comparison sample evacuated
Geometry: single crystal, contactless microwave cavity
Context: pristine hydrated MOF compared with dehydrated 1·2H2O sample
Measurement source: 7702 · Physical Measurements · Figure 8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
microwave response maximum temperature	around 250 K	—	around	Text Approximate	7706 · Proton Conduction · Figure 8
microwave relaxation time near 250 K	~1 x 10^-11 s	—	~	Text Approximate	7706 · Proton Conduction · Figure 8
maximum microwave real conductivity of hydrated 1·3H2O	about 3 x 10^-3 S cm^-1 near 250 K from Figure 8	0.3 S m^-1	visual estimate	Figure Axis Approximate	7706 · Proton Conduction · Figure 8