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Compounds with Oxalate-Bridged Dinuclear Cu^IICu^II and Cu^IINb^V Units: Structures and Magnetismm (CROSBI ID 517811)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Perić, Berislav ; Jurić, Marijana ; Giester, Gerald ; Pajić, Damir ; Zadro, Krešo ; Planinić, Pavica ; Brničević, Nevenka Compounds with Oxalate-Bridged Dinuclear Cu^IICu^II and Cu^IINb^V Units: Structures and Magnetismm // Fifteenth Slovenian-Croatian Crystallographic Meeting. Book of Abstracts / Lah, Nina ; Leban, Ivan (ur.). Ljubljana: Univerza v Ljubljani, 2006. str. 43-43-x

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

Povezanost rada

Fizika, Kemija