Eight coordination compounds assembled from unexplored semi-rigid ether-based unsymmetrical tetracarboxylate and various dipyridyl ligands: structural variation, magnetic and photoluminescence properties. Issue 44 (14th October 2019) - Yue, Qi
Abstract : Eight new coordination compounds built by an unexplored semi-rigid ether-based unsymmetrical tetracarboxylate and varied dipyridyl ligands have been synthesized. Their variety of structures, photoluminescence and magnetic properties are discussed. Abstract : By incorporating a semi-rigid ether-based unsymmetrical tetracarboxylic acid [H4 detc = 2, 3, 3′, 4′-diphenyl ether tetracarboxylic acid] with various ancillary dipyridyl ligands [phen = 1, 10-phenanthroline, bipy = 4, 4′-bipyridine, bpea = 1, 2-bis(4-pyridyl)ethane, and bpee = 1, 2-bis(4-pyridyl)ethylene], eight new coordination compounds were hydrothermally synthesized. [Mn(H2 detc)(phen)2 ]·H2 O (1 ) and [Cd(H3 detc)2 (bipy)2 ·H2 O]·6H2 O (2 ) are two supramolecular networks built from binuclear and mononuclear structures, respectively. [Cd2 (detc)(phen)2 ]·0.5H2 O (3 ) and [Zn(H2 detc)(bipy)] (4 ) are two luminescent 1D loop chain structures with [M2 (detc)2 ] metallacycle units. [Ni2 (detc)(bpee)2 ·5H2 O]·1.5H2 O (5 ) exhibits a 2D fishbone-like double-layered network. [Co2 (detc)(bpea)2 ·H2 O] (6 ) features a 3D framework containing a 1D [Co2 (μ2 -COO)(μ2 -Ocarboxylate )] chain. [Cu2 (detc)(bpee)·2H2 O]·4H2 O (7 ) possesses a two-fold interpenetration 3D framework with a pcu net topology. [Ni2 (detc)(bpea)2 ·3H2 O]·3H2 O (8 ) displays a three-fold interpenetration 3D framework with a (3, 3, 4)-connected new topological net. Magnetic susceptibility measurements indicate antiferromagnetic exchange interactions between the Co(ii ) ions in 6 . The photoluminescence spectra of compounds 2, 3 and 4 show the corresponding emission bands of their ancillary dipyridyl ligands.