Synthesis, Crystal Structures and Spectroscopic Properties of a Trinuclear [Cu3(HL)2(NO3)2](H2O)(CH2CH2OH) Complex and a [Mn(HL)(CH3COO)]n Polymer With H3L= N,N’-(2-hydroxypropane-1,3-diyl)-bis-(salicylaldimine)

Moussa Dienga, Ibrahima Thiama, Mohamed Gaye*a, Abdou Salam Salla, Aliou H. Barryb

aUniversité Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Chimie, Dakar, Sénégal
bDépartement de Chimie, Faculté des Sciences Université de Nouakchott, Mauritanie

Absrtract
A new trinuclear copper(II) complex [Cu3(HL)2(NO3)2](H2O)(CH2CH2OH) (1) and a new polymer complex of manganese (III) [Mn(HL)(CH3COO)]n (2) where H3L is N,N’-(2-hydroxypropane-1,3-diyl)-bis-(salicylaldimine) have been prepared and characterized by molar conductance, magnetic measurements, infrared spectral studies and the single crystal structure of the complexes. The crystal structure features the presence of two independent molecules in the asymmetric unit of 1. The polymeric unit of 2 is formed by a Mn-O bridge of one molecule with its centrosymmetric homologue. The Schiff base acts as tridentate in its dianionic form in the two complexes. In the case of the copper complex 1 the nitrate groups are found to be bidentate bridging and the terminal copper(II) ions assume a square pyramidal geometry while the  central copper(II)  has distorted square bipyramidal geometry. In complex 2 the acetate group acts as bidentate bridging and the manganese (III) ion has distorted octahedral geometry.

Keywords: copper(II), manganese(III), crystal structure, nitrate, acetate.