Syntheses and solid state structures of zinc (II) complexes with Bi-dentate N-(Aryl)imino-acenapthenone (Ar-BIAO) ligands

Anga, S and Rej, K and Naktode, K and Pal, T and Panda, Tarun K (2015) Syntheses and solid state structures of zinc (II) complexes with Bi-dentate N-(Aryl)imino-acenapthenone (Ar-BIAO) ligands. Journal of Chemical Sciences, 127 (1). pp. 103-113. ISSN 0974-3626

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Abstract

We have synthesized five zinc complexes of molecular formulae [ZnCl 2 (2,6-dimethylphenyl- BIAO)] 2 ( 1a ), [ZnBr 2 (2,6-dimethylphenyl-BIAO)] 2 ( 1b ), [ZnI 2 (2,6-dimethylphenyl-BIAO)] 2 ( 1c ), [ZnBr 2 (mes- BIAO)] 2 ( 2b) and [ZnBr 2 (dipp-BIAO)] ( 3b) with rigid unsymmetrical imi noacenaphthenone ligands, (2,6- dimethylphenyl-BIAO) ( 1 ), (mesityl-BIAO) ( 2 ) and (2,6-diisopropylphenyl-BIAO) ( 3 ).Thezinccomplex 1a was prepared by the reaction of ZnCl 2 and neutral (mesityl-BIAO) ( 1 ). However, complexes 1b , 2b and 3b were obtained by the treatment of ZnBr 2 and neutral ligands 1 – 3 respectively in 1:1 molar ratio in dichloromethane at ambient temperature. In a similar reaction of ZnI 2 with (2,6-dimethylphenyl-BIAO) ( 1 ) in dichloromethane the corresponding iodo-complex 1c was obtained in good yield. All the zinc (II) complexes are characterized by FT-IR, 1 Hand 13 C{ 1 H} NMR spectroscopic techniques. The solid state structures of the complexes 1a , 1b , 1c , 2b and 3b are confirmed by single crystal X-ray diffraction analysis. The molecular structures of com- plexes 1a , 1b , 1c and 2b reveal the dimeric nature of the complexes and subsequently the centre atom zinc is penta-coordinated to adopt distorted trigonal bipyr amidal geometry around it. In contrast, the complex 3b is in monomeric in nature due to bulkier size of the ligand and zinc ion is tetra coordinated to adopt distorted tetrahedral geometry.

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IITH Creators:
IITH CreatorsORCiD
Panda, Tarun Khttp://orcid.org/0000-0003-0975-0118
Item Type: Article
Uncontrolled Keywords: Zinc(II); iminoacenathenone; penta - and tetra- coordinated; metallacycle; chelating ligands; steric crowding
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Library Staff
Date Deposited: 10 Mar 2015 10:36
Last Modified: 07 Sep 2017 11:03
URI: http://raiith.iith.ac.in/id/eprint/1386
Publisher URL: https://doi.org/10.1007/s12039-014-0756-z/
OA policy: http://www.sherpa.ac.uk/romeo/issn/0974-3626/
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