Issue 13, 2012
From the journal:

CrystEngComm

Two-dimensional (6,3) networks obtained with the {Cu3(Hmesox)3}3− secondary building unit (H4mesox = mesoxalic acid)†

Beatriz Gil-Hernández,a   Pedro Gili,a   Jorge Pasán,b   Joaquín Sanchiz*a  and  Catalina Ruiz-Pérez*b  

* Corresponding authors

a Grupo de Materiales Magnéticos, Departamento de Química Inorgánica, Universidad de La Laguna, Av. Astrofísico Francisco Sánchez, s/n, La Laguna, Tenerife, Spain
E-mail: jsanchiz@ull.es, pgili@ull.es, beagher@ull.es
Tel: +34 922 316502 ext. 5425

b Laboratorio de Rayos X y Materiales Moleculares, Departamento de Física Fundamental II, Facultad de Física, Universidad de La Laguna, Av. Astrofísico Francisco Sánchez s/n, La Laguna, Tenerife, Spain
E-mail: caruiz@ull.es, jpasang@ull.es
Tel: +34 922 318236

Abstract

The compounds [La(H2O)3Cu3(Hmesox)3(H2O)5]·8H2O (1) and [La(H2O)2Cu3(Hmesox)3(H2O)3]·7H2O (2) have been prepared by the reaction of mesoxalic acid with basic copper(II) carbonate and lanthanum nitrate (H4mesox = mesoxalic acid, dihydroxymalonic acid). The compounds have been characterized by single crystal X-ray diffraction, magnetic susceptibility measurements and DFT calculations. The structure of both compounds is built up by [Cu3(Hmesox)3(H2O)5]3− and [Cu3(Hmesox)3(H2O)3]3− trinuclear entities (for 1 and 2, respectively) linked to La(III) ions to yield 2D sheets with the (6,3) topology if the lanthanum atom and the Cu3 centroids are considered as nodes. Due to the diamagnetic character of the La(III) ion the magnetic behaviour of both compounds is related to the copper(II) trinuclear entities, which display antiferromagnetic coupling making one of the S = 1/2 spin states to be the spin ground state. The magnetic coupling constants of the trinuclear units are determined by means of magnetic susceptibility measurements and they exhibit the expected trend showing strong antiferromagnetic couplings for large Cu–O–Cu bridging angles. Additionally, DFT calculations performed on these complexes agree with the experimental values obtained.

Graphical abstract: Two-dimensional (6,3) networks obtained with the {Cu3(Hmesox)3}3− secondary building unit (H4mesox = mesoxalic acid)

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Article information

DOI
https://doi.org/10.1039/C2CE06418A
Article type
Paper
Submitted
25 Oct 2011
Accepted
21 Dec 2011
First published
31 Jan 2012

CrystEngComm, 2012,14, 4289-4297

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Two-dimensional (6,3) networks obtained with the {Cu3(Hmesox)3}3− secondary building unit (H4mesox = mesoxalic acid)

B. Gil-Hernández, P. Gili, J. Pasán, J. Sanchiz and C. Ruiz-Pérez, CrystEngComm, 2012, 14, 4289 DOI: 10.1039/C2CE06418A

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