Three Co(II) metal-organic frameworks based on a substituted thiophene carboxylic acid ligand with semiconductive properties
Abstract
Three Co(II) metal-organic frameworks, namely, {[Co(L)(dpyb)0.5(H2O)2]·3H2O}n (1), {[Co(L)(dpyb)0.5]·CH3CN}n (2), and {[Co2(L)2(dpyp)1.5(H2O)]}n (3) have been hydrothermally synthesized based on a substituted thiophene carboxylic acid 3,3‧-(thiophene-2,5-diyl)dibenzoic acid (H2L) and auxiliary N-donor co-ligands 1,4-di(pyridin-4-yl)benzene (dpyb) and 1,3-di(4-pyridyl)propane (dpyp). 1 possesses a 1D double chains structure, which is further extended into a 3D supramolecular framework via O-H···O hydrogen bonds and π···π interactions. 2 shows a novel 2D + 2D→ 2D network with unusual polyrotaxane entanglements of (4, 4)-sql subnets. The two sets of adjacent such networks are further extended via C-H···π interactions into a 3D supramolecular framework. 3 displays a non-interpenetrated 2D sheet with the point symbol {44.62} sql net topology and further extends via π···π interactions into a 3D supramolecular framework. The three MOFs were characterized by IR spectra, elemental analysis, thermal analysis and single crystal X-ray diffraction. In addition, solid-state UV-vis spectra experiments show that 1, 2, and 3 exhibit semiconductive properties with band gap of 2.23, 2.95, and 3.12 eV.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- November 2018
- DOI:
- 10.1016/j.jssc.2018.08.015
- Bibcode:
- 2018JSSCh.267...68J
- Keywords:
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- 3;
- 3‧-(thiophene-2;
- 5-diyl)dibenzoic acid;
- Co(II) metal-organic framework;
- Semiconductive properties