A New Highly Thermally Stable Co(II)-coordination polymer with Semi-flexible Bis(Imidazole) Directed Secondary Building Unit: Solvothermal Syntheses and Structures

Year 2018, Volume: 5 Issue: 3, 1083 - 1094, 01.09.2018

Fatih Semerci

https://doi.org/10.18596/jotcsa.355518

Abstract

A
new thermally highly stable 2D coordination polymer, formulated as
[Co(μ6-aO2btc)_0.5(μ-obix)]_n  (ao2btc = dioxygenated form of
3,3′,5,5′-azobenzenetetracarboxylate) synthesized using the semi-flexible
1,2-bis(imidazole-1-ylmethyl)benzene (obix) ligand in solvothermal conditions
and characterized by single-crystal diffraction, FT-IR and photoluminescence
spectroscopy and thermogravimetric/differential thermal analysis.
Crystallographic studies of complex 1
reveal that two Co(II) ions are bridged by carboxylate groups of ao2btc ligand
to form paddle-wheel SBU. These SBUs are stabilized by the coordination of obix
ligand. The Co(II) ions are µ₆-bridged by hexadentate aO2btc ligand
to generate 2D polymer chains with 3,4-connected binodal net (point symbol {4.6²}₂{4².6².8²})
and topological type is 3,4L13. Thermal analysis shows that complex 1 thermally
stable up to 401 °C.

Keywords

coordination polymers, bis(imidazole) ligands, azobenzenetetracarboxylate ligand

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