Two
new coordination polymers of formulas [Cd2(2,3-pzdc)(tz)2] (1) and [Cd2(2,3-pzdc)(dtz)2] (2) {2,3-pzdc = 2,3-pyrazine dicarboxylate,
tz = 1,2,4-triazolate, dtz = 3,5-diamino-1,2,4-triazolate)} were synthesized via hydrothermal techniques. Both the compounds were characterized
by single-crystal X-ray analysis, powder X-ray diffraction, Fourier
transform infrared (FTIR), and thermogravimetric analysis (TGA). Single-crystal
X-ray analysis shows that both the structures are three-dimensional
in nature and connectivity-wise they are similar to each other. In
compound 2, the presence of N–H···O
hydrogen-bond interactions further stabilized the structure. Aqueous
dispersion of both the compounds showed a strong dual emissionone
at around 353 nm and another at 369 nm upon excitation at 280 nm.
Lifetime studies from time-resolved spectra show 0.82 and 0.60 ns
for compound 1 and 2.02 and 1.78 ns for compound 2. The higher lifetimes of the excited states in the case
of compound 2 establish the role of hydrogen-bond interactions
in reducing the nonradiative decay processes. To explore the junction
properties at the Al/material interface of these Schottky barrier
diodes, the dark J–V characteristics of both
of the devices (ITO/PEDOT/compound 1/Al and ITO/PEDOT/compound 2/Al) were analyzed using the well-known Shockley diode equation.
In both the devices (with compound 1 and compound 2), asymmetric behavior is observed under forward and reverse
bias, indicating rectification. However, in the compound 2 device, the overall current magnitude is 10 times higher than that
of the compound 1 device. The series resistance extracted
for the compound 2 device is ≈ 22 times lower
than that of the compound 1 device, indicating the higher
conductivity of compound 2. This behavior indicates a
probable role of hydrogen-bond interactions in the lower resistance
and higher conductivity of compound 2 compared to compound 1.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.