A first-principles analysis of the magnetism of CuII polynuclear coordination complexes: the case of [Cu4(bpy)4(aspartate)2(H2O)3](ClO4)4.2.5H2O.
The magnetic structure of the [Cu4(bpy)4(aspartate)2(H2O)3](ClO4)4.2.5 H2O crystal -- using fractional coordinates determined at room-temperature -- has been analysed in detail. This analysis has been carried out by extending our first principles bottom-up theoretical approach, which was initially designed to study through-space magnetic interactions, to handle through-bond magnetic interactions. The only input data required by this approach are the values of the computed J(AB) exchange parameters for all the unique pairs of spin-containing centres. The results allow the magnetic structure of the crystal, which presents two types of isolated tetranuclear CuII clusters, to be defined in quantitative terms. Each of these clusters presents ferro and antiferromagnetic interactions, the former being stronger, although outnumbered by the latter. The computed magnetic susceptibility curve shows the same qualitative features as the experimental data. However, there are small differences that are presumed to be associated with the use of room-temperature crystal coordinates.
Deumal
Mercè
M
Departament de Química Física, Facultat de Química, and CERQT, Parc Cientìfic, Universitat de Barcelona, Av. Diagonal, 647, 08028-Barcelona, Spain. m.deumal@qf.ub.es
Ribas-Ariño
Jordi
J
Robb
Michael A
MA
Ribas
Joan
J
Novoa
Juan J
JJ
D001224:Aspartic Acid / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004583:Electrons; D008280:Magnetics; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D013696:Temperature
D009942:Organometallic Compounds; D001224:Aspartic Acid; D003300:Copper