Crystal structure of a polymeric complex of lead(II) with 2,6-dihydroxybenzoic acid

• Published in: Inorganica Chimica Acta Vol. 202; no. 1; pp. 43 - 48
• Main Authors: Glowiak, Tadeusz, Kozlowski, Henryk, Erre, Liliana Strinna, Micera, Giovanni, Gulinati, Beatrice
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.12.1992; Elsevier Science
• Subjects: Chemistry; Condensed matter: structure, mechanical and thermal properties; Coordination compounds; Exact sciences and technology; Inorganic chemistry and origins of life; Inorganic compounds; Metal complexes; Physics; Preparations and properties; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Lead II Complexes; Hydroxyacid; Molecular structure; Carboxylate; Polynuclear complex; Organic ligand; Benzenic compound; Experimental study; X ray diffraction; Crystalline structure
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(00)85348-7

The complex Pb 2(DHB) 4·3H 2O (DHB = 2,6-dihydroxybenzoate(−1)) has been prepared and characterized using single-crystal X-ray diffraction. The compound consists of a polymeric network which accommodates two types of lead ions. The coordination polyhedron around the first of them can be described as a distorted pentagonal bipyramid, where four carboxylate and one phenolic oxygens are the basal coordinating atoms, while the water molecule and a second phenolic group are in the apical positions. The second lead atom is involved in a dimeric PbPb unit (metal-metal distance: 4.23 Å) bridged by two water molecules lying at distances of 2.59 and 2.61 Å, respectively. The coordination at each atom of this dimeric entity is completed by a bidentate carboxylate, a monodentate carboxylate, a water molecule and two phenolic groups resulting in a heavily distorted square antiprismatic stereochemistry. The Cd(II) complex is likely to have the same structure as the lead complex.