Homochiral Mn.sup.3+./sup. spin-crossover complexes: a structural and spectroscopic study

0556424 - FZÚ 2023 RIV US eng J - Journal Article
Kühne, Irina A. - Ozarowski, A. - Sultan, A. - Esien, K. - Carter, A.B. - Wix, P. - Casey, A. - Heerah-Booluck, M. - Keene, T.D. - Müller-Bunz, H. - Felton, S. - Hill, S. - Morgan, G.G.
Homochiral Mn³⁺ spin-crossover complexes: a structural and spectroscopic study.
Inorganic Chemistry. Roč. 61, č. 8 (2022), s. 3458-3471. ISSN 0020-1669. E-ISSN 1520-510X
R&D Projects: GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : manganese * spin crossover * EPR * chiral
OECD category: Inorganic and nuclear chemistry
Impact factor: 4.6, year: 2022
Method of publishing: Open access

Structural, magnetic, and spectroscopic data on a Mn3+ spin-crossover complex with Schiff base ligand 4-OMe-Sal2323, isolated in crystal lattices with X = ClO4– (1), BF4– (2), NO3– (3), Br– (4), and I– (5) and crystallize isotypically in the chiral orthorhombic space group P21212. Complexes 1 and 2 are high-spin, complex 4 undergoes a gradual and complete thermal spin crossover, while complexes 3 and 5 show stepped crossovers with different ratios of spin triplet and quintet forms in the intermediate temperature range. High-field electron paramagnetic resonance was used to measure the zero-field splitting parameters associated with the spin triplet and quintet states at temperatures below 10 K for complexes 4 and 2. Solid-state circular dichroism (CD) spectra on high-spin complex 1 at room temperature reveal a 2:1 ratio of enantiomers in the chiral conglomerate, and solution CD measurements on the same sample in methanol show that it is stable toward racemization.
Permanent Link: http://hdl.handle.net/11104/0330650