Magnetochemistry 2015, 1(1), 45-61; doi:10.3390/magnetochemistry1010045
Novel Topologies in Vanadium-bis-β-Diketone Chemistry: A [V4] and a [V6] Metallacyclophane
Ivana Borilovic 1, Olivier Roubeau 2, Irene Fernández Vidal 3, Simon J. Teat 4 and Guillem Aromí 1,*
1
Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 645, Barcelona 08028, Spain
2
Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, Zaragoza 50009, Spain
3
Unitat d’Espectrometria de Masses de Caracterització Molecular, CCiT, Universitat de Barcelona, Martí i Franqués 1-11, Barcelona 08028, Spain
4
Advanced Light Source, Berkeley Laboratory, 1 Cyclotron Road, MS2-400, Berkeley, CA 94720, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Carlos J. Gómez García
Received: 2 October 2015 / Revised: 13 November 2015 / Accepted: 18 November 2015 / Published: 2 December 2015
(This article belongs to the Special Issue Magnetochemistry: From Fundamentals to Applications)
Abstract
Exploring the chemistry of vanadyl ions (VO2+) with bis-β-diketone ligands, in pyridine reactions of vanadyl sulfate with 1,3-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-benzene (H4L1) and 1,3-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-pyridine (H4L2), two novel clusters, [(VIVO)4(H2L1)4(py)4] (1) and [(VVO)4(VIVO)2 (O)4(L2)2(py)6] (2) were prepared and characterized. Due to the conformational flexibility of the ligands, both entities exhibit very peculiar metal topologies and composition, differing significantly from structural patterns established in the related chemistry of divalent 3d metals. Structural analysis also unveils the existence of the most complex metallamacrocycles from this family to date. Studies of the magnetic properties via bulk magnetization measurements and EPR spectroscopy confirmed the existence of uncoupled long-distant S = 1/2 metal centers and the spin ground states S = 2 and S = 1 of the clusters. View Full-TextKeywords:
vanadyl clusters; poly-β-diketone ligands; magnetic properties; self-assembly; metallamacrocycles
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Borilovic, I.; Roubeau, O.; Fernández Vidal, I.; Teat, S.J.; Aromí, G. Novel Topologies in Vanadium-bis-β-Diketone Chemistry: A [V4] and a [V6] Metallacyclophane. Magnetochemistry 2015, 1, 45-61.
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