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Issue 41, 2013
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Layered transition metal carboxylates: synthesis, structural aspects and observation of multi-step magnetic transition through phase diagram

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Abstract

Two new layered transition metal carboxylate frameworks, [Co3(L)2(H2O)6]·2H2O (1) and [Ni3(L)2(H2O)6]·2H2O (2) (L = tartronate anion or hydroxymalonic acid), have been synthesized and characterized by X-ray single crystal analysis. Both compounds have similar 2D structures. In both compounds there are two types of metal centers where one center is doubly bridged by the alkoxy oxygen atoms through μ2-O bridging to form a 1D infinite chain parallel to the crystallographic b-axis with the corners shared between the metal polyhedra. Magnetic susceptibility measurements revealed the existence of antiferromagnetic short range correlations between Co(Ni) intra-chain metal centers (with exchange constants JCo = −22.6 and JNi = −35.4 K). At low temperatures, long range order is observed in both compounds at Néel temperatures of 11 (for 1) and 16 (for 2) K, revealing that other exchange interactions, rather than the intra-chain ones, play a role in these systems. Whereas compound 1 has an antiferromagnetic ground state, compound 2 exhibits a ferromagnetic component, probably due to spin canting. Isothermal magnetization data unveiled a rich phase diagram with three metamagnetic phase transitions below 8 K in compound 1.

Graphical abstract: Layered transition metal carboxylates: synthesis, structural aspects and observation of multi-step magnetic transition through phase diagram

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Supplementary files

Article information


Submitted
18 Jun 2013
Accepted
05 Aug 2013
First published
07 Aug 2013

Dalton Trans., 2013,42, 14836-14843
Article type
Paper

Layered transition metal carboxylates: synthesis, structural aspects and observation of multi-step magnetic transition through phase diagram

R. Sen, D. Mal, A. M. L. Lopes, P. Brandão, J. P. Araújo and Z. Lin, Dalton Trans., 2013, 42, 14836
DOI: 10.1039/C3DT51626A

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