Citation: DING Ke, SUN Zun-Ming, LI Hou-Qian, TANG Liang-Fu. Reaction of Tungsten Carbonyl with Bis(pyrazol-1-yl)methanes Functionalized by Azaaryl Groups[J]. Chinese Journal of Inorganic Chemistry, ;2015, (2): 345-352. doi: 10.11862/CJIC.2015.058
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Reaction of W(CO)6 with (N-methylimidazol-2-yl)bis(3,5-dimethylpyrazol-1-yl)methane (L1), (pyridin-2-yl)bis(3,5-dimethylpyrazol-1-yl)methane (L2) and (pyridin-4-yl)bis(3,5-dimethylpyrazol-1-yl)methane (L3) yielded complexes LW(CO)5 (L=L1 or L3), LW(CO)4 (L=L1, L2 or L3) and LW(CO)3 (L=L1 or L2), respectively. NMR, IRand X-ray structural analyses indicated that these three ligands possessed variable coordination modes in these complexes. L1 and L3 acted as monodentate ligands through the imidazolyl nitrogen or the pyridyl nitrogen in LW(CO)5. A N,N'-chelating bidentate ligand through the imidazolyl nitrogen and one pyrazolyl nitrogen was observed in L1W(CO)4, while L2 and L3 acted as N,N-chelating bidentate ligands through two pyrazolyl nitrogens in L2W(CO)4 and L3W(CO)4. A tridentate N,N,N'-chelating ligand through two pyrazolyl nitrogens and the imidazolyl or 2-pyridyl nitrogen was observed in L1W(CO)3 and L2W(CO)3. The different donor ability of these imidazolyl, pyridyl and pyrazolyl nitrogens possibly plays important roles for the structural diversity. CCDC: 1030402, 2; 1030403, 4; 1030404, 7.
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