Synthesis and characterization of self-assembled coordination polymers of N -diaminomethylene-4-(3-formyl-4-hydroxy-phenylazo)-benzenesulfonamide.

El-Ghamry, Hoda; Sakai, Ken; Masaoka, Shigeyuki; El-Baradie, Kamal; Issa, Raafat

The azo dye ligand N-diaminomethylene-4-(3-formyl-4-hydroxy-phenylazo)-benzenesulfonamide (HL) and Cu(II), Co(II), and Mn(II) coordination polymers were synthesized in addition to a non-polymeric Pd(II) complex. In all complexes, the ligand bonds to the metal ion through the formyl and α-hydroxy oxygen atoms. The sulfonamide oxygen also coordinates to the metal. The complexes are formulated as [ML2] n , where M = Cu(II), Co(II), and Mn(II), and [ML(Cl)(H2O)], where M = Pd(II). On the basis of spectral studies and magnetic susceptibility measurements, an octahedral geometry was assigned to Co(II) and Mn(II) complexes, tetragonally elongated octahedral geometry for Cu(II) complex, while the Pd(II) complex was found to be square planar. Crystallization of Cu(II) complex from DMF afforded single crystals of general formula {[Cu(L)2] · 3DMF} n (2). X-ray structural analysis of 2 revealed that each Cu(II) adopts elongated octahedral geometry affording 1-D chains. The chains are connected by hydrogen bonds, resulting in the formation of 2-D supramolecular assemblies. The crystal structure of HL has also been determined and discussed. Cyclic voltammetric behavior of the ligand and some complexes are also discussed.

COORDINATION compounds; MOLECULAR self-assembly; COORDINATION polymers; ALDEHYDES; BENZENESULFONAMIDES; HYDROXY acids; CRYSTAL structure; METAL complexes

Journal of Coordination Chemistry, 2012, Vol 65, Issue 5, p780

0095-8972

Academic Journal

10.1080/00958972.2012.661418