(μ2-Adipato-κ4O, O': O'', O''')bis-[aqua-(benzene-1,2-di-amine-κ2N, N')-chlorido-cadmium]: crystal structure and Hirshfeld surface analysis

Wannur Sofiasalamah Khairiah A Rahman; J Ahmad; Siti Nadiah Abdul Halim; Mukesh M Jotani; Edward R T Tiekink

doi:10.1107/S2056989017011677

(μ₂-Adipato-κ⁴O, O': O'', O''')bis-[aqua-(benzene-1,2-di-amine-κ²N, N')-chlorido-cadmium]: crystal structure and Hirshfeld surface analysis

Acta Crystallogr E Crystallogr Commun. 2017 Aug 21;73(Pt 9):1363-1367. doi: 10.1107/S2056989017011677. eCollection 2017 Sep 1.

Authors

Wannur Sofiasalamah Khairiah A Rahman¹, J Ahmad^{1

2}, Siti Nadiah Abdul Halim¹, Mukesh M Jotani³, Edward R T Tiekink⁴

Affiliations

¹ Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
² Department of Chemistry, Kulliyyah of Science, International Islamic University Malaysia, 25200 Kuantan, Pahang, Malaysia.
³ Department of Physics, Bhavan's Sheth R. A. College of Science, Ahmedabad, Gujarat 380 001, India.
⁴ Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia.

Abstract

The full mol-ecule of the binuclear title compound, [Cd₂Cl₂(C₆H₈O₄)(C₆H₈N₂)₂(H₂O)₂], is generated by the application of a centre of inversion located at the middle of the central CH₂-CH₂ bond of the adipate dianion; the latter chelates a Cd^II atom at each end. Along with two carboxyl-ate-O atoms, the Cd^II ion is coordinated by the two N atoms of the chelating benzene-1,2-di-amine ligand, a Cl^- anion and an aqua ligand to define a distorted octa-hedral CdClN₂O₃ coordination geometry with the monodentate ligands being mutually cis. The disparity in the Cd-N bond lengths is related to the relative trans effect exerted by the Cd-O bonds formed by the carboxyl-ate-O and aqua-O atoms. The packing features water-O-H⋯O(carboxyl-ate) and benzene-1,2-di-amine-N-H⋯Cl hydrogen bonds, leading to layers that stack along the a-axis direction. The lack of directional inter-actions between the layers is confirmed by a Hirshfeld surface analysis.

Keywords: adipic acid; benzene-1,2-diamine; cadmium; crystal structure; hydrogen bonding.