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Titolo:
New concepts for molecular magnets
Autore:
Pilawa, B;
Indirizzi:
Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76128 hys, D-76128 Karlsruhe, Germany
Titolo Testata:
ANNALEN DER PHYSIK
fascicolo: 3, volume: 8, anno: 1999,
pagine: 191 - 254
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROPHENYL NITRONYL NITROXIDE; ELECTRON-SPIN-RESONANCE; ORGANIC RADICAL CRYSTAL; VERDAZYL FREE-RADICALS; HEXAPERYLENE HEXAFLUOROPHOSPHATE; EXCHANGE INTERACTION; WEAK FERROMAGNETISM; IRON(III) IONS; BETA-PHASE; P-NPNN;
Keywords:
magnetism; radicals; molecular cluster; spectroscopy; electron spin resonance;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
129
Recensione:
Indirizzi per estratti:
Indirizzo: Pilawa, B Univ Karlsruhe, Inst Phys, Engesserstr 7, D-76128 Karlsruhe, Germany Univ Karlsruhe Engesserstr 7 Karlsruhe Germany D-76128 Germany
Citazione:
B. Pilawa, "New concepts for molecular magnets", ANN PHYSIK, 8(3), 1999, pp. 191-254

Abstract

Miller and Epstein (1994) define molecular magnets as magnetic materials which are prepared by the low-temperature methods of the preparative chemistry. This definition includes molecular crystals of neutral radicals, radical salts and charge transfer complexes as well as metal complexes and polymers with unpaired spins (Dormann 1995). The challenge of molecular magnets consists in tailoring magnetic properties by specific modifications of the molecular units. The combination of magnetism with mechanical or electrical properties of molecular compounds promise materials of high technical interest (Gatteschi 1994a and 1994b, Mohwald 1996) and both the chemical synthesis of new molecular materials with magnetic properties as well as the physical investigation and explanation of these properties is important, in order to achieve any progress. This work deals with the physical characterization of the magnetic properties of molecular materials. It is organized as follows, in the first part molecular crystals of neutral radicals are studied. After briefly discussing the general magnetic properties of these materials and after an overview over the physical principles of exchange interaction between organic radicals I focus on the interplay between the: crystallographic structure and the magnetic properties of various derivatives of theverdazyl and nitronyl nitroxide radicals. The magnetic properties of metalcomplexes are the subject of the second part. After an overview over the experimental and theoretical tools which are used for the investigation of the magnetic properties I shortly discuss the exchange coupling of transition metal ions and the magnetic properties of complexes of two and three metal ions. Special emphasis is given to spin cluster compounds. Spin cluster denote complexes of many magnetic ions. They are attractive as building blocks of molecular magnets as well as magnetic model compounds for the study of spin frustration, molecular super-paramagnetism and quasi one-dimensionalmagnets.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 15:56:34