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Syntheses and Crystal Structures of Five Cadmium( II ) Complexes Derived from 4‐Aminobenzoic Acid
Author(s) -
Wang Ruihu,
Hong Maochun,
Luo Junhua,
Cao Rong,
Shi Qian,
Weng Jiabao
Publication year - 2002
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 - 10.1002/1099-0682(200211)2002:11<2904::aid-ejic2904>3.0.co;2-l
Subject(s) - chemistry , hydrogen bond , crystallography , ligand (biochemistry) , denticity , crystal structure , carboxylic acid , molecule , stereochemistry , polymer chemistry , organic chemistry , biochemistry , receptor
Five cadmium( II ) complexes, [CdClL·H 2 O] n ( 1 ), [CdBrL·H 2 O] n ( 2 ), CdI 2 (HL) 2 ( 3 ), {[Cd(dca) 2 (HL) 2 ]·2H 2 O} n (dca − = dicyanamide) ( 4 ), and (H 2 L) 2 [CdCl 4 (H 2 O) 2 ] ( 5 ), have been synthesized by the reaction between 4‐aminobenzoic acid (HL) and Cd 2+ . In 1 and 2 , L − serves as a tridentate ligand and bridges six‐coordinate Cd II centers to form [Cd II −L] n chains; halide anions link adjacent chains into two‐dimensional layers. Complex 3 is a typical metallic carboxylic acid synthon. In 3 , HL acts as a monodentate ligand coordinating to Cd II through the nitrogen atom, and the head‐to‐tail hydrogen bonds of carboxylic groups result in a zigzag chain. The weak Cd ··· I interactions between adjacent chains extend the zigzag chain‐like structure into a two‐dimensional structure. Complex 4 consists of [Cd(dca) 2 (HL) 2 ] n chains and free water molecules. The twelve‐membered rings formed by water molecules and carboxylic groups through hydrogen bonds link the adjacent chains to yield a two‐dimensional layer. Complex 5 consists of discrete [CdCl 4 (H 2 O) 2 ] 2− anions and H 2 L + organic cations, which are linked by intermolecular hydrogen‐bonding interactions to form a three‐dimensional structure. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)