catena-Poly[[diaqua(isonicotinato-κ2O,O′)gadolinium(III)]-di-μ-isonicotinato-κ4O:O′]

✍ Scribed by Chen, Feng-Ying ;Wu, Wang-Ting ;Liu, Feng ;Yao, Li ;He, Shui-Yang

• Publisher: International Union of Crystallography
• Year: 2007
• Tongue: English
• Weight: 901 KB
• Volume: 63
• Category: Article
• ISSN: 1600-5368
• DOI: 10.1107/s160053680703320x

✦ Synopsis

Single crystals of the title compound, [Gd(C 6 H 4 NO 2 ) 3 -(H 2 O) 2 ] n , were obtained by evaporation of an aqueous solution of isonicotinic acid and gadolinium(III) nitrate. The Gd III cation is eight-coordinated by four carboxylate O atoms of bridging isonicotinate anions, two carboxylate O atoms of a chelating isonicotinate anion and two water molecules. The coordination environment around the rare earth cation might be described as a distorted bicapped trigonal prism. As a result of the two coordination modes of the isonicotinate ligands (with one as a bidentate chelate ligand and the others as bridging ligands), an infinite chain along the a axis is formed. Medium-strength hydrogen bonds of the types O-HÁ Á ÁO and O-HÁ Á ÁN between the water molecules and adjacent chains generate a three-dimensional framework.