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Volumn 5, Issue 9, 1999, Pages 2554-2565

The molecular and electronic structure of octahedral tris(phenolato)iron(III) complexes and their phenoxyl radical analogues: A Mossbauer and resonance Raman spectroscopic study

Author keywords

Iron; Magnetic properties; Moessbauer spectroscopy; Phenoxyl radicals; Resonance Raman spectroscopy

Indexed keywords

CATION; COORDINATION COMPOUND; FERRIC CHLORIDE; FERRIC ION; FERROMAGNETIC MATERIAL; IRON COMPLEX; LIGAND; MACROCYCLIC COMPOUND; PHENOL DERIVATIVE; RADICAL;

EID: 0032821544     PISSN: 09476539     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3765(19990903)5:9<2554::AID-CHEM2554>3.0.CO;2-H     Document Type: Article
Times cited : (56)

References (59)
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    • note
    • For the concentrated solution (1.5 mM) the spectra showed an additional broad absorption-derivative signal at g ≈ 2 that changed upon dilution. However, the pattern persisted even at 20 μM concentration and varied for different preparations. We suppose that the neutral complexes tend to aggregate in solution. The resulting enhanced intermolecular spin-spin interaction could give rise to the collapsed signal at g ≈ 2. On the other hand, such a feature could not be reasonably well simulated with the usual rhombic spin Hamiltonian [Eq. (4)].
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    • note
    • x′x′ oriented in the z direction.
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    • note
    • The large asymmetry parameter was essentially confirmed by the symmetric hyperfine pattern of a magnetically perturbed measurement (7 T) at 160 K, which indicated that η is close to 1. However, under these conditions spin relaxation appeared to be in an intermediate range with respect to the nuclear precession rate as the spectrum was not satisfactorily resolved. We therefore refrain from depicting the result of a preliminary simulation, performed with the Hamiltonian [Eqs. (4),(5)] in the limit of fast or slow relaxation.
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    • note
    • A similar effect is discussed for 3s electrons that can be polarized by negative spin density in the overlap region of metal - ligand bonds, see ref. [31].


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.