TY - JOUR
T1 - Syntheses, hydrogen-bonded assembly structures, and spin crossover properties of [FeIII(Him)2(n-MeOhapen)]PF6 (Him = imidazole and n-MeOhapen = N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine); n = 4, 5, 6)
AU - Fujinami, Takeshi
AU - Ikeda, Mizuki
AU - Koike, Masataka
AU - Matsumoto, Naohide
AU - Oishi, Tomohiro
AU - Sunatsuki, Yukinari
PY - 2015/6/1
Y1 - 2015/6/1
N2 - Three iron(III) complexes, [FeIII(Him)2(n-MeOhapen)]PF6 (1: n = 4, 2: n = 5, 3: n = 6), where Him = imidazole and n-MeOhapen = N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine, were synthesized. Each FeIII ion was coordinated by N4O2 donor atoms of equatorial n-MeOhapen and two axial Him. The saturated FeC2N2 chelate ring involving the ethylenediamine moiety adopted a gauche conformation and the two phenylidene planes of [FeIII(Him)2(n-MeOhapen)]+ were oriented opposite to the FeO2N2 coordination plane. Two adjacent [FeIII(Him)2(4-MeOhapen)]+ cations in 1 were connected via PF6- ions by hydrogen bonds between the imidazole group and PF6- to give a one-dimensional chain. Two adjacent cations in 2 were connected via hydrogen bonds between the phenylidene oxygen and imidazole atoms to form a cyclic dimer structure. Two EtOH molecules were involved in a hydrogen-bonded cyclic dimer structure in 3. Compounds 1 and 2 showed spin crossover behavior, but 3 showed incomplete spin crossover.
AB - Three iron(III) complexes, [FeIII(Him)2(n-MeOhapen)]PF6 (1: n = 4, 2: n = 5, 3: n = 6), where Him = imidazole and n-MeOhapen = N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine, were synthesized. Each FeIII ion was coordinated by N4O2 donor atoms of equatorial n-MeOhapen and two axial Him. The saturated FeC2N2 chelate ring involving the ethylenediamine moiety adopted a gauche conformation and the two phenylidene planes of [FeIII(Him)2(n-MeOhapen)]+ were oriented opposite to the FeO2N2 coordination plane. Two adjacent [FeIII(Him)2(4-MeOhapen)]+ cations in 1 were connected via PF6- ions by hydrogen bonds between the imidazole group and PF6- to give a one-dimensional chain. Two adjacent cations in 2 were connected via hydrogen bonds between the phenylidene oxygen and imidazole atoms to form a cyclic dimer structure. Two EtOH molecules were involved in a hydrogen-bonded cyclic dimer structure in 3. Compounds 1 and 2 showed spin crossover behavior, but 3 showed incomplete spin crossover.
KW - Assembly structures
KW - Hydrogen bonds
KW - Imidazole
KW - Iron(III) complex
KW - NO Schiff-base ligand
KW - Spin equilibrium
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U2 - 10.1016/j.ica.2015.03.034
DO - 10.1016/j.ica.2015.03.034
M3 - Article
AN - SCOPUS:84927711947
VL - 432
SP - 89
EP - 95
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
ER -