Abstract
Coordination polymers are useful materials in different fields of
applications, including the development of supramolecular electrical
devices for the use of renewable energy sources. In this work, we have
designed two new classes of mixed-ligand one-dimensional coordination
polymers (1D CPs) [Zn(ADC)(PBT)2(H2O)2]n (1) and [Zn(Succ)(PBT)2(H2O)2]n (2) (ADC2–, acetylenedicarboxylato; Succ2–,
succinato; PBT, 2-pyridin-4-ylbenzothiazole) and characterized them by
elemental analysis, infrared spectra (IR), single-crystal X-ray
diffraction data, powder X-ray diffraction (PXRD), and thermogravimetric
analysis (TGA) data. In the structural motif Zn(II) is bridged by an
aliphatic dicarboxylato ligand (ADC/Succ) and two axial positions are
occupied by pyridyl-N of PBT along with water coordination. ADC acts as a monodentate carboxylato-O ligand in compound 1, whereas in 2 Succ serves as a carboxylato-O,O chelator. Compounds 1 and 2 are both isostructural and construct 3D supramolecular networks by hydrogen bonds (bonding) and π···π interactions along with weak C–H···π interactions. Fascinatingly, compound 1 exhibits an ∼700 times higher Schottky barrier diode (SBD) electrical conductivity (1.31 × 10–2 S m–1) in comparison to compound 2 (1.80 × 10–5 S m–1). The impedance electrical conductivities of 1 (1.22 × 10–4 S m–1) and 2 (3.24 × 10–6 S m–1) differ significantly; in addition, the direct current conductivities are 1.08 × 10–4 S m–1 (1) and 5.55 × 10–6 S m–1 (2).
To shed light on the charge transport mechanism of the compounds, the
mobility, transit time, and density of states at a quasi-Fermi level
have been evaluated. Linear dicarboxylato bridging with an sp-hybrid
acetylene motif may be the reason for faster charge flow in 1 in comparison to the sp3 hybrid nonlinear succinato bridging compound 2
Original language | English |
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Pages (from-to) | 2632-2641 |
Number of pages | 10 |
Journal | Crystal Growth & Design |
Volume | 19 |
Issue number | 5 |
Early online date | 2 Apr 2019 |
DOIs | |
Publication status | Published - 1 May 2019 |
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Enhancement of electrical conductivity due to structural distortion from linear to nonlinear dicarboxylato-bridged Zn(II) 1D-coordination polymers (crystallographic data)
Naskar, K. (Creator), Sil, S. (Creator), Sahu, N. (Creator), Dutta, B. (Creator), Slawin, A. M. Z. (Creator), Ray, P. P. (Creator) & Sinha, C. (Creator), Cambridge Crystallographic Data Centre, 2019
https://dx.doi.org/10.5517/ccdc.csd.cc20p22w and one more link, https://dx.doi.org/10.5517/ccdc.csd.cc20p25z (show fewer)
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