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A twofold interpenetrating three‐dimensional heterometallic metal–organic framework with pcu topology based on 2‐methylbiphenyl‐4,4′‐dicarboxylic acid
Author(s) -
Guo Pei-Ying,
Ma De-Yun,
Guo Hai-Fu
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229617006829
Subject(s) - carboxylate , chemistry , crystallography , ligand (biochemistry) , octahedron , supramolecular chemistry , topology (electrical circuits) , atom (system on chip) , luminescence , metal organic framework , octahedral molecular geometry , stereochemistry , crystal structure , materials science , organic chemistry , combinatorics , mathematics , biochemistry , receptor , computer science , embedded system , optoelectronics , adsorption
The 2‐methylbiphenyl‐4,4′‐dicarboxylate (mbpdc 2− ) ligand has versatile coordination modes and can be used to construct multinuclear structures. Despite this, reports of the synthesis of coordination complexes involving this ligand are scarce. The title compound, poly[[triaquadi‐μ 3 ‐hydroxido‐hexakis(μ 4 ‐2‐methylbiphenyl‐4,4′‐dicarboxylato)calcium(II)hexazinc(II)] monohydrate], {[CaZn 6 (C 15 H 10 O 4 ) 6 (OH) 2 (H 2 O) 3 ]·H 2 O} n , has been prepared by the hydrothermal assembly of Zn(NO 3 ) 2 ·6H 2 O, CaCl 2 and 2‐methylbiphenyl‐4,4′‐dicarboxylic acid. Two Zn II atoms adopt a four‐coordinated distorted tetrahedral geometry by bonding to three O atoms from three different 2‐methylbiphenyl‐4,4′‐dicarboxylate (mbpdc 2− ) dianionic ligands and one bridging hydroxide O atom. For the remaining Zn II atom, a five‐coordinate environment is completed half the time by one carboxylate O atom, and then the same carboxylate O atom and an aqua O atom are present the other half of the time, giving a six‐coordinate environment. The Ca II atom is coordinated by six O atoms to give an octahedral coordination geometry. The supramolecular secondary building unit (SBU) is a hamburger‐like heptanuclear unit (Zn 6 CaO 30 ) and these units are interconnected through mbpdc 2− carboxylate groups to generate a three‐dimensional framework with the pcu topology. The single net leaves voids that are filled by mutual interpenetration of an independent equivalent framework in a twofold interpenetrating architecture. The title compound shows thermal stability up to 673 K. The excitation and luminescence data showed the emission of a bright‐blue fluorescence.