Crystal structure and characterization of a new one-dimensional copper(II) coordination polymer containing a 4-amino-benzoic acid ligand

Alisha Gogia; Egor M Novikov; Ilia A Guzei; Marina S Fonari; Tatiana V Timofeeva

doi:10.1107/S2056989024001336

Crystal structure and characterization of a new one-dimensional copper(II) coordination polymer containing a 4-amino-benzoic acid ligand

Acta Crystallogr E Crystallogr Commun. 2024 Feb 20;80(Pt 3):330-334. doi: 10.1107/S2056989024001336. eCollection 2024 Mar 1.

Authors

Alisha Gogia¹, Egor M Novikov¹, Ilia A Guzei², Marina S Fonari³, Tatiana V Timofeeva¹

Affiliations

¹ Department of Chemistry, New Mexico Highlands University, Las Vegas, New, Mexico, 87701, USA.
² Chemistry Department, University of Wisconsin-Madison, 1101 University Ave, Madison, WI 53706, USA.
³ Institute of Applied Physics, Moldova State University, Academy str., 5 MD2028, Chisinau, Moldova.

Abstract

A Cu^II coordination polymer, catena-poly[[[aqua-copper(II)]-bis-(μ-4-amino-benz-o-ato)-κ² N:O;κ² O:N] monohydrate], {[Cu(pABA)₂(H₂O)]·H₂O}_n (pABA = p-amino-benzoate, C₇H₄NO₂ ^-), was synthesized and characterized. It exhibits a one-dimensional chain structure extended into a three-dimensional supra-molecular assembly through hydrogen bonds and π-π inter-actions. While the twinned crystal shows a metrically ortho-rhom-bic lattice and an apparent space group Pbcm, the true symmetry is monoclinic (space group P2/c), with disordered Cu atoms and mixed roles of water mol-ecules (aqua ligand/crystallization water). The luminescence spectrum of the complex shows an emission at 345 nm, cf. 349 nm for pABAH.

Keywords: 4-aminobenzoic acid; crystal structure; one-dimensional coordination polymer; pABAH.

Grants and funding

Funding for this research was provided by: NSF (grant No. DMR-2122108 (PREM)).