| Budget Amount *help |
¥15,200,000 (Direct Cost: ¥15,200,000)
Fiscal Year 2006: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2005: ¥12,300,000 (Direct Cost: ¥12,300,000)
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| Research Abstract |
In order to activate these inactive small molecules such as N_2, O_2, S_8, CO, NO, and C_2H_4 etc. by using 1 st row transition metal complexes, we prepared many complexes with N2, N3, and N4 type nitrogen containing ligands, such as various neutral bis (pyrazolyl) methanes, neutral tris(pyrazolyl)methanes, anionic hydrotris (pyrazolyl) borates, and neutral tris (pyrazolylmethyl) amine ligands. The obtained complexes were characterized in detail by many spectroscopies and computational works. To address the general conclusions, we carried out mainly the following 6 categories
1. With hindered pyrazole derivatives, we synthesized novel bidentate bis (pyrazolyl) methanes, tris (pyrazolyl) metanes, and tris (pyrazolylmethyl) amine ligands. With these ligands, we also discussed the coordinated nitrogen numbers, electronic and steric influences, and steric hindrances for the obtained complexes.
2. Copper(II)-μ-peroxo complex with tris (pyrazolyl) methane was structurally characterized. The differences between the neutral methane and anionic borate ligands in there structures and properties were discussed.
3. Furthermore, we developed the complexes with N_20^-, NO_3^-, CO, and NO. The obtained complexes were characterized well.
4. For modeling mononuclear copper containing enzymes, we prepared phenoxo and catecholato complexes. Especially, some steric effects of the ligands were observed.
5. Mononuclear iron(II) α-keto and carboxylato complexes were prepared as models for the active sites of non-heme iron oxygenases. The effects on the hydroxylated phenyl groups were examined. After then, we demonstrated new reaction mechanism for these enzymatic reactions.
6. We found new olefin polymerization catalysts by use manganese(II) ion. Some ligand effects on the ligand was observed.
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