Synthesis and structural characterization of a new polymeric zinc(II) complex with thiophene-2-carboxylic acid

Author(s)

Cagnin, F. ^[1] ; Castellano, E. E. ^[2] ; Davolos, M. R. ^[1]

Affiliation

^[1] Univ Estadual Paulista, Inst Quim, Dept Quim Geral & Inorgan, Lab Mat Luminescentes, BR-14800900 Araraquara, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Coordination Chemistry; v. 63, n. 13, p. 2278-2285, 2010.
• Web of Science Citations: 2

Abstract

A new polymeric zinc(II) complex with thiophene-2-carboxylic acid (-tpc) of composition {[}Zn2(C20H12O8S4)]n was obtained and structurally characterized by X-ray diffraction, thermal analysis, nuclear magnetic resonance (NMR), and infrared spectroscopies. Upfield shift in the 1H-NMR spectrum is explained by the crystalline structure, which shows the thiophene rings overlapping each other in parallel pairs. The compound crystallizes in the monoclinic system, space group P21/c, with a = 9.7074(4) angstrom, b = 13.5227(3) angstrom, c = 18.9735(7) angstrom, = 95.797(10)degrees, and Z = 4. Three -tpc groups bridge between two Zn(II) ions through oxygens and the fourth one bridges between one of these ions and the third one, symmetry related by a twofold screw axis. This arrangement gives rise to infinite chains along the crystallographic a direction. The metal atoms display an approximate tetrahedral configuration. The complex is insoluble in water, ethanol, and acetone, but soluble in dimethyl sulfoxide. (AU)

• FAPESP's process: 07/06072-2 - Europium(III)and zinc(II) luminescent coordination compounds for OLEDS
• Grantee: Flávia Cagnin
• Support Opportunities: Scholarships in Brazil - Master