Compounds with Oxalate-Bridged Dinuclear Cu^IICu^II and Cu^IINb^V Units: Structures and Magnetismm (CROSBI ID 517811)
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Podaci o odgovornosti
Perić, Berislav ; Jurić, Marijana ; Giester, Gerald ; Pajić, Damir ; Zadro, Krešo ; Planinić, Pavica ; Brničević, Nevenka
engleski
Compounds with Oxalate-Bridged Dinuclear Cu^IICu^II and Cu^IINb^V Units: Structures and Magnetismm
The structural and magnetic properties of the two novel compounds: [(Cu(phen)_2)_2(mu-C_2O_4)][Cu(phen)_2(mu-C_2O_4)NbO(C_2O_4)_2]_2 center dot 8H_2O (1) and [(Cu(bpy)_2)_2(mu-C_2O_4)][Cu(bpy)_2(mu-C_2O_4)NbO(C_2O_4)_2]_2 center dot 0.5bpy center dot 7H_2O (2) (phen = 1, 10-phenanthroline, bpy = 2, 2'-bipyridine) was presented. The molecular structures of both compounds consist of a discrete Cu^IICu^II oxalate-bridged dinuclear [(Cu(L)_2)_2(mu-C_2O_4)]^2+ cations (A units) and two Cu^IINb^V oxalate-bridged dinuclear [Cu(L)_2(mu-C_2O_4)NbO(C_2O_4)_2]^- anions (B units) (L = phen, bpy). In 1 a crystallographic inversion centre is located in the middle of the oxalate bridge of the A unit, whereas in 2 an analogous inversion centre is missing. In the A units the copper(II) atoms adopt a tetragonally elongated octahedral coordination with the equatorial planes being perpendicular to the mean planes of the oxalate bridge and parallel to each other. In both structures, similar one-dimensional structural motifs are generated through the ligand stacking interactions, with a difference that one free bipyridine molecule, present in 2, intercalates into one of the motifs. It is shown that the phenanthroline ligand, due to its ability of stacking through the central aromatic ring, causes longer intermolecular Cu...Cu distances than the bipyridine ligand. Structural data are correlated with the magnetic susceptibility measurements (1.8 - 290 K) which show the ferromagnetic exchange interaction between the copper(II) atoms in the A units of both compounds, with J = + 5.9 cm^-1 and + 7.9 cm^-1 for 1 and 2, respectively (J is the magnetic exchange parameter in the isotropic spin Hamiltonian H_(INT) = -JS1xS2).
dinuclear complexes; oxalate-bridged complexes; copper; niobium; crystal structure; magnetism
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Podaci o prilogu
43-43-x.
2006.
objavljeno
Podaci o matičnoj publikaciji
Fifteenth Slovenian-Croatian Crystallographic Meeting. Book of Abstracts
Lah, Nina ; Leban, Ivan
Ljubljana: Univerza v Ljubljani
Podaci o skupu
Fifteenth Slovenian-Croatian Crystalographic Meeting
predavanje
15.06.2006-18.06.2006
Jezersko, Slovenija