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Titolo:
MAGNETISM OF SELF-ASSEMBLED MONONUCLEAR AND TETRANUCLEAR SUPRAMOLECULAR NI2+ COMPLEXES
Autore:
WALDMANN O; HASSMANN J; MULLER P; VOLKMER D; SCHUBERT US; LEHN JM;
Indirizzi:
UNIV ERLANGEN NURNBERG,INST PHYS 3 D-91058 ERLANGEN GERMANY UNIV STRASBOURG 1,ISIS F-67000 STRASBOURG FRANCE
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 6, volume: 58, anno: 1998,
pagine: 3277 - 3285
SICI:
0163-1829(1998)58:6<3277:MOSMAT>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
O. Waldmann et al., "MAGNETISM OF SELF-ASSEMBLED MONONUCLEAR AND TETRANUCLEAR SUPRAMOLECULAR NI2+ COMPLEXES", Physical review. B, Condensed matter, 58(6), 1998, pp. 3277-3285

Abstract

The magnetization of a novel supramolecular grid structure consistingof four bis(bipyridyl)-pyrimidine ligands and four Ni2+ ions and thatof the mononuclear analogue Ni(terpy)(2) was measured. Magnetic anisotropy was determined from investigations of powder as well as of crystal samples. We provide evidence for an intramolecular antiferromagnetic coupling of the four Ni2+ spins of the tetranuclear species with J= -8 K. The magnetization of the mononuclear complex is typical for a S=1 spin with zero field splitting. The magnetization of the tetranuclear grid is discussed in terms of the effective spin Hamiltonian appropriate for Ni2+ ions including various higher order exchange terms. In particular, significant indications for a biquadratic term of about J' = 0.5 K is found.

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Documento generato il 24/09/20 alle ore 05:06:40