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Four Alkali‐Induced 3D Strontium(II) Coordination Polymers Constructed from Imidazole‐4,5‐dicarboxylate: Syntheses, Crystal Structures, and Properties
Author(s) -
Zhang XianFa,
Deng ZhaoPeng,
Huo LiHua,
Feng QingMao,
Gao Shan
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200796
Subject(s) - chemistry , strontium , crystallography , alkali metal , imidazole , molecule , ligand (biochemistry) , coordination polymer , crystal structure , stereochemistry , organic chemistry , biochemistry , receptor
Four alkali‐induced 3D coordination polymers, namely [Sr(HIDC)(H 3 IDC)(H 2 O)] n · n H 2 O ( 1 ), [Sr(HIDC)] n ( 2 ), [Sr 3 (HIDC) 2 (H 2 IDC) 4 ] n ( 3 ), and [Sr 2 (HIDC) 2 ] n ( 4 ), were constructed from strontium(II) and imidazole‐4,5‐dicarboxylic acid (H 3 IDC) and were characterized by elemental analysis, IR, TG, PL, powder and single‐crystal X‐ray diffraction. Complex 1 is an eca net with the Schläfli symbol of (3 9 .4 12 .5 7 ) by considering the Sr II cation as an 8‐connected node. Complex 2 presents a rare 5‐connected network with Schäfli symbol of (4 5 .6 5 ) when the Sr II cation and HIDC 2– dianion are viewed as 5‐connected nodes. Complex 3 is a complicated 3D network, which can be regarded as a H 2 IDC – monoanion sustained porous framework filled by another HIDC 2– dianion and H 2 IDC – monoanion. Complex 4 exhibits a 3D porous framework with 1D trigonal hydrophobic channels. The ligand H 3 IDC in the four complexes exists as the H 3 IDC molecule, the H 2 IDC – monoanion, and the HIDC 2– dianion. In addition, the μ 2 (κ 1 N :κ 1 O :κ 1 O ) mode of the H 3 IDC molecule in complex 1 , the μ 3 (κ 1 O :κ 1 O :κ 1 O :κ 1 O ) and μ 3 (κ 1 N :κ 1 O :κ 1 O :κ 1 O ) modes of the H 2 IDC – monoanion in complex 3 , as well as the μ 5 (κ 1 N :κ 2 O :κ 1 O :κ 2 O :κ 1 O ) and μ 6 (κ 1 N :κ 2 O :κ 2 O :κ 2 O :κ 2 O ) modes of the HIDC 2– dianion in complexes 2 and 4 are reported for the first time. Diverse topological architectures of the four complexes depend mainly on the coordination spheres of the Sr II cation, the coordination modes of the anions, the different alkali, and the ligand to alkali ratio. TG analysis indicates that complex 2 presents high thermal stability, while the TG curve and temperature‐dependent PXRD spectra of complex 4 indicate that its framework is stable up to 350 °C. Moreover, the solid‐state luminescent properties demonstrate that complexes 1 to 4 exhibit strong blue emission at room temperature.