TY - JOUR
T1 - Nickel(II) and iron(II) mononuclear complexes with 1-methylimidazole-2- aldoximate
T2 - New building units for molecule-assembled magnetic materials
AU - Miyasaka, Hitoshi
AU - Saitoh, Ayumi
AU - Yanagida, Sayaka
AU - Kachi-Terajima, Chihiro
AU - Sugiura, Ken Ichi
AU - Yamashita, Masahiro
N1 - Funding Information:
This work was supported by PRESTO project and CREST project, Japan Science and Technology Agency (JST).
PY - 2005/8/1
Y1 - 2005/8/1
N2 - A new class of mononuclear metal complexes with 1-methylimidazole-2- aldoximate (miao) has been synthesized and characterized: trans-Ni II(Cl)2(Hmiao)2 (1), trans-Ni II(miao)2(py)2 (2), NO-trans-Ni II(miao)2(phen) (3), and NO-trans-FeII(miao) 2(phen) (4). The crystal structures of 2, 3, and 4 have been determined by single-crystal X-ray crystallography. Compound 1 having the protonated miao ligand (i.e., Hmiao) is a precursor for synthesizing 2 and 3. Compound 2 is an octahedral NiII complex surrounded by two miao bidentate ligands and two monodentate ligands of pyridine in a trans-arrangement. Compound 3 is a cis-type octahedral NiII complex with two miao ligands and a bidentate ligand of 1,10-phenanthroline, in which the ligand arrangement around NiII center is found in an NO-trans form. Compound 4 is an isostructural FeII derivative of 3. Compounds 1, 2, and 3 exhibit paramagnetic nature with an S = 1 spin and a positive zero-field splitting, among which it for 3 is overlapped with intermolecular ferromagnetic interaction (zJ/kB = +0.16 K). Compound 4 is diamagnetic due to the existence of low-spin FeII ion.
AB - A new class of mononuclear metal complexes with 1-methylimidazole-2- aldoximate (miao) has been synthesized and characterized: trans-Ni II(Cl)2(Hmiao)2 (1), trans-Ni II(miao)2(py)2 (2), NO-trans-Ni II(miao)2(phen) (3), and NO-trans-FeII(miao) 2(phen) (4). The crystal structures of 2, 3, and 4 have been determined by single-crystal X-ray crystallography. Compound 1 having the protonated miao ligand (i.e., Hmiao) is a precursor for synthesizing 2 and 3. Compound 2 is an octahedral NiII complex surrounded by two miao bidentate ligands and two monodentate ligands of pyridine in a trans-arrangement. Compound 3 is a cis-type octahedral NiII complex with two miao ligands and a bidentate ligand of 1,10-phenanthroline, in which the ligand arrangement around NiII center is found in an NO-trans form. Compound 4 is an isostructural FeII derivative of 3. Compounds 1, 2, and 3 exhibit paramagnetic nature with an S = 1 spin and a positive zero-field splitting, among which it for 3 is overlapped with intermolecular ferromagnetic interaction (zJ/kB = +0.16 K). Compound 4 is diamagnetic due to the existence of low-spin FeII ion.
KW - Iron(II) complex
KW - Nickel(II) complexes
KW - Oximato ligand
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U2 - 10.1016/j.ica.2005.05.010
DO - 10.1016/j.ica.2005.05.010
M3 - Article
AN - SCOPUS:21944439195
VL - 358
SP - 3525
EP - 3535
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
IS - 12
ER -