TY - JOUR
T1 - Synthesis and magnetic properties of tetrahedral tetranuclear iron(II) complexes with bis(bidentate)-type Schiff bases containing imidazole groups
AU - Tanaka, Tsubasa
AU - Sunatsuki, Yukinari
AU - Suzuki, Takayoshi
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant-in-Aid for Scientific Research(C) # 15K05455 (Y. Sunatsuki). The authors gratefully thank Research Instruments Center, Okayama University of Science for the magnetic measurements. Appendix A
Funding Information:
This work was supported by JSPS KAKENHI Grant-in-Aid for Scientific Research(C) #15K05455 (Y. Sunatsuki). The authors gratefully thank Research Instruments Center, Okayama University of Science for the magnetic measurements.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - Two new tetranuclear iron(II) complexes, [Fe4(H2LH)6](ClO4)8 (1ClO4: H2LH = N,N′-bis(imidazole-4-ylmethylidene)-1.4-diaminobenzene) and [Fe4(H2LMe)6](BF4)8 (2BF4: H2LMe = N,N′-bis(5-methylimidazole-4-ylmethylidene)-1.4-diaminobenzene), were synthesized from Fe(ClO4 or BF4)2·6H2O, 1.4-diaminobenzene and 4-formylimidazole or 5-methyl-4-formylimidazole. X-ray analysis revealed that these complexes have a tetrahedral structure with four iron(II) ions at the apexes and the bridging bis(bidentate) ligands on the edges. The internal space of the tetrahedron was filled with the phenylene segments of the bridging ligands. Magnetic susceptibility studies indicated that both 1ClO4 and 2BF4 showed gradual but incomplete spin-crossover (SCO) behavior, because the densely packed tetrahedral structure could prevent the contraction of the Fe–N bonds on the high-spin to low-spin transition.
AB - Two new tetranuclear iron(II) complexes, [Fe4(H2LH)6](ClO4)8 (1ClO4: H2LH = N,N′-bis(imidazole-4-ylmethylidene)-1.4-diaminobenzene) and [Fe4(H2LMe)6](BF4)8 (2BF4: H2LMe = N,N′-bis(5-methylimidazole-4-ylmethylidene)-1.4-diaminobenzene), were synthesized from Fe(ClO4 or BF4)2·6H2O, 1.4-diaminobenzene and 4-formylimidazole or 5-methyl-4-formylimidazole. X-ray analysis revealed that these complexes have a tetrahedral structure with four iron(II) ions at the apexes and the bridging bis(bidentate) ligands on the edges. The internal space of the tetrahedron was filled with the phenylene segments of the bridging ligands. Magnetic susceptibility studies indicated that both 1ClO4 and 2BF4 showed gradual but incomplete spin-crossover (SCO) behavior, because the densely packed tetrahedral structure could prevent the contraction of the Fe–N bonds on the high-spin to low-spin transition.
KW - Bis(bidentate)-type ligand
KW - Hydrogen bonding network
KW - Imidazole containing ligand
KW - Iron(II) complexes
KW - Tetrahedral tetranuclear complex
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U2 - 10.1016/j.ica.2019.119373
DO - 10.1016/j.ica.2019.119373
M3 - Article
AN - SCOPUS:85077014897
SN - 0020-1693
VL - 502
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
M1 - 119373
ER -