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Supramolecular Structures with the 2‐Propyl‐4,5‐dicarboxy‐1 H ‐imidazole Ligand: Hydrothermal Synthesis, Structures, and Photoluminescence
Author(s) -
Li XiaoXu,
Wang Ning,
Yue ShanTang,
Li ZhaoYang,
Wu HongYan,
Liu YingLiang
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200900143
Subject(s) - hydrogen bond , supramolecular chemistry , crystallography , chemistry , imidazole , ligand (biochemistry) , ring (chemistry) , crystal structure , thermogravimetric analysis , stereochemistry , molecule , organic chemistry , biochemistry , receptor
Abstract Self‐assembly of the rigid organic ligand 2‐propyl‐4,5‐dicarboxy‐1 H ‐imidazole ( L ) with different metal ions (Zn 2+ , Ni 2+ , Cu 2+ , Cd 2+ ) led to four new complexes, namely, [M( L )(phen)] [M = Zn ( 1 ); Ni ( 2 ); Cd ( 3 )] and [Cu( L )( 4 )] (phen = 1,10‐phenanthroline). Their structures were determined by single‐crystal X‐ray diffraction analyses, and they were further characterized by elemental analysis, IR spectroscopy, and thermogravimetric analysis. Whereas compounds 1 , 2 , and 3 are discrete units, hydrogen‐bonding interactions play a vital role in these complexes. Compounds 1 and 2 form one‐dimensional (1D) and two‐dimensional (2D) structures through hydrogen‐bondinginteractions with helical character. In 1 , the hydrogen bonds (O–H ··· O) alternately bridge the M II cations of the discrete units to form a one‐dimensional (1D) infinite helical chain. Complex 2 forms a 2D helical layer through parallel hydrogen bonds (N/O–H ··· O/N) between two adjacent helical chains. In 3 , the hydrogen bonds (N–H ··· O) connect adjacent discrete units into a ten‐membered ring with extension into a one‐dimensional double‐chain supramolecular structure. Complex 4 is a two‐dimensional gridlike (4,4) topological layer which is extended to a 3D network by hydrogen bonding. The solid‐state fluorescence spectrum of complex 3 was determined.