Diversity of coordination modes in the polymers based on 3,3′,4,4′-biphenylcarboxylate ligand

Syntheses, structures, and magnetism of two coordination compounds with 3,3′,4,4′-biphenyltetracarboxylic acid and 1,10-phenanthroline

“…The solid-state photoluminescence spectrum of 1 is depicted in ''Supplementary material.'' Upon excitation at ca 330 nm for 1, the emission peak is located at 466 nm, a red shift of ca 78 nm relative to that of free biphenyl-3,3 0 ,4,4 0 -tetracarboxylic dianhydride [42,65]. We tentatively assign it to ligand-to-metal charge transfer (LMCT) [66,67].…”

“…Considerable efforts have been devoted to developing flexible or V-shaped multidentate bridging ligands [30][31][32][33][34][35][36][37][38][39][40]. However, the nature of the rigid aromatic multidentate ligands to form the overall configuration has been scarcely investigated so far magnetic study of the transition metal coordination polymers bridged by carboxylate ligand [42][43][44][45][46][47][48][49][50][51][52][53][54][55]. In this regard, 3,3 0 ,4,4 0 -biphenyltetracarboxylic acid (3,4-H 4 bptc) was examined to take advantage of unique features of hydroxypolycarboxylic acids: (1) versatile coordination behavior from completely or partially deprotonated acid; (2) polycarboxylics are nonchelating, chelating, bridging, and hydrogen-bond acceptors and donors to form extended structures; (3) two phenyl rings can be rotated around the C-C single bond [42,56].…”