Spin-crossover in iron() coordination compounds with 2,6-bis(benzimidazol-2-yl)pyridine

New iron( ii ) complexes with 2,6-bis(benzimidazol-2-yl)pyridine (L), in particular, [FeL 2 ]A 2 · n H 2 O (A = Br − (I), NO 3 − (II), C 2 N 3 − (III); n = 1 (I), 0.5 (II), 2 (III)) and [NiL 2 ]Br 2 ·1.23H 2 O·3.33EtOH (IV), have been synthesized and studied using single-crystal and powder X-ray dif...

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Bibliographic Details
Published in:New journal of chemistry 2020-04, Vol.44 (15), p.5834-584
Main Authors: Ivanova, A. D, Korotaev, E. V, Komarov, V. Yu, Sheludyakova, L. A, Varnek, V. A, Lavrenova, L. G
Format: Article
Language:English
Subjects:
Coordination compounds
Crossovers
Crystallography
Infrared spectroscopy
Iron
Magnetic permeability
Mossbauer spectroscopy
Single crystals
X ray powder diffraction
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Summary:New iron( ii ) complexes with 2,6-bis(benzimidazol-2-yl)pyridine (L), in particular, [FeL 2 ]A 2 · n H 2 O (A = Br − (I), NO 3 − (II), C 2 N 3 − (III); n = 1 (I), 0.5 (II), 2 (III)) and [NiL 2 ]Br 2 ·1.23H 2 O·3.33EtOH (IV), have been synthesized and studied using single-crystal and powder X-ray diffraction techniques, UV-vis (diffuse reflection), IR and Mössbauer spectroscopy, as well as static magnetic susceptibility measurements. According to the experimental μ eff ( T ) curves all the studied iron( ii ) compounds exhibit 1 A 1 ↔ 5 T 2 spin-crossover. Novel iron( ii ) bromide, nitrate and dicyanamide complexes with 2,6-bis(benzimidazol-2-yl)pyridine possessing high-temperature 1 A 1 ↔ 5 T 2 spin crossover were obtained.
ISSN:1144-0546
1369-9261
DOI:10.1039/d0nj00474j