Tuning Different Kinds of Entangled Networks Formedby Isomers of Bis(1,2,4-triazol-1-ylmethyl)benzene and a FlexibleTetracarboxylate Ligand.

In order to tune the Zn(II) coordinationpolymer architectures,three position isomers, 1,4- (pbtmb), 1,3- (mbtmb), and 1,2-bis(1,2,4-triazol-1-ylmethyl)benzene(obtmb), and flexible tetracarboxylate ligand, 5,5′-(1,4-phenylenebis(methylene))bis(oxy)diisophthalicacid (H4L1), were used to assemble compounds with different kindsof entangled networks, namely, {[Zn2(L1)(pbtmb)2]·4H2O}n(1), {[Zn2(L1)(mbtmb)2]·4H2O}n(2), and [Zn2(L1)(obtmb)2]n(3). Flexible bis(triazole) ligands present diverseconformations in these compounds. Compound 1shows a4-fold interpenetrating three-dimensional architecture with 4-connectedmog (moganite) topology. Compound 2displays a 2D + 2D→ 3D polycatenation network simplified as new 4-connected topologywith the Schlafli notation of {4,64;8}2{42,64}. Compound 3is a 2D polythreadingstructure, in which two layed networks interpenetrate in a (2D/2D)parallel fashion. The powder X-ray diffraction, thermal stabilities,and the photoluminescence of 1–3havealso been investigated. [ABSTRACT FROM AUTHOR]