Eight coordination compounds assembled from unexplored semi-rigid ether-based unsymmetrical tetracarboxylate and various dipyridyl ligands: structural variation, magnetic and photoluminescence properties†
By incorporating a semi-rigid ether-based unsymmetrical tetracarboxylic acid [H4detc = 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(H2detc)(phen)2]·H2O (1) and [Cd(H3detc)2(bipy)2·H2O]·6H2O (2) are two supramolecular networks built from binuclear and mononuclear structures, respectively. [Cd2(detc)(phen)2]·0.5H2O (3) and [Zn(H2detc)(bipy)] (4) are two luminescent 1D loop chain structures with [M2(detc)2] metallacycle units. [Ni2(detc)(bpee)2·5H2O]·1.5H2O (5) exhibits a 2D fishbone-like double-layered network. [Co2(detc)(bpea)2·H2O] (6) features a 3D framework containing a 1D [Co2(μ2-COO)(μ2-Ocarboxylate)] chain. [Cu2(detc)(bpee)·2H2O]·4H2O (7) possesses a two-fold interpenetration 3D framework with a pcu net topology. [Ni2(detc)(bpea)2·3H2O]·3H2O (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.