Journal article Open Access

Synthesis and structure of mixed metal Zn3Ni2 -complexes of tetradentate Schiff bases

Rajib Lal De; Rajib Kumar De

Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata-700 032, India

E-mail : rajiblal@hotmail.com

Manuscript received 13 January 2014, revised 26 June 2014, accepted 03 July 2014

The nickel(II) tetradentate Schiff base complexes, Ni(SALEN), Ni(S-BrSALEN), Ni(SALPNx ) and Ni(SALPNy ) underwent facile reactions with zinc perchlorate hexahydrate, Zn(ClO4 )2 .6H2O resulting in excellent complex formations. Compounds of formula [{ZnL}2Zn(H2O)2 ](ClO4 )2 .2NiL.½H2O (where L = N,N´-ethylenebis(salicylideneiminato) dianion, (SALEN)2–; N,N´-ethylenebis(5-bromosalicylideneiminato) dianion, (5-BrSALEN)2–; N,N´-1,3-propylenebis(salicylideneiminato) dianion, (SALPNx )2–; N,N´-1,2-propylenebis(salicylideneiminato) dianion, (SALPNy )2–] were isolated as powdery solid materials and were characterized by spectroscopic methods and X-ray crystallographic structure analysis. Single cryatal X-ray crystallographic structure analysis performed on [{Zn(SALEN)}2Zn(H2O)2 ](ClO4 )2 .2Ni(SALEN).½H2O (1) showed it to crystallize in monoclinic space group, C2/c with Z = 4, and a = 28.527(2), b = 10.175 (1), c = 24.161(2) Å, β = 111.892(5)º. The geometric centre of the molecule lies on a crystallographic two-fold axis. Two of the three ZnII ions are in square planar coordination with two SALEN dianions whereas the centrally located ZnII ion is coordinated to two water molecules and to four oxygen atoms of the two Zn(SALEN) fragments formed in situ during the course of the reaction, in a distorted octahedral fashion showing the presence of ZnII ions in two different coordination environments in a single complex. The structure is completed with two perchlorate ions, two Ni(SALEN) molecules and there is only half water molecule per formula unit.

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