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研究了(氮甲基咪唑-2-基)双(3,5-二甲基吡唑)甲烷(L1),2-吡啶基双(3,5-二甲基吡唑)甲烷(L2)及4-吡啶基双(3,5-二甲基吡唑)甲烷(L3)与羰基钨的反应,合成了一系列以单齿,双齿及三齿氮配位的羰基金属衍生物LW(CO)5(L=L1或L3),LW(CO)4(L=L1,L2或L3)和LW(CO)3(L=L1或L2)。核磁,红外及X-射线单晶衍射分析表明这3种配体表现出了可变的配位方式。在LW(CO)5中,当配体为L1时,其倾向于通过咪唑氮与金属配位,而为L3则倾向于利用吡啶氮与金属作用;在LW(CO)4中,配体L1表现为通过咪唑氮和吡唑氮原子配位的[N,N′]双齿配体,而L2和L3表现为通过吡唑氮原子配位的[N,N]双齿配体;在LW(CO)3中,L1和L2起着[N,N,N′]三齿螯合配体的作用。
(N, N-dimethylpyrazole) methane (L1), 2-pyridylbis Reaction of 4-pyridylbis (3,5-dimethylpyrazolyl) methane (L3) with carbonyl tungsten has resulted in the synthesis of a series of carbonyl metal derivatives LW (CO ) 5 (L = L1 or L3), LW (CO) 4 (L = L1, L2 or L3) and LW (CO) 3 (L = L1 or L2). NMR, IR and single crystal X-ray diffraction analysis showed that these three ligands showed a variable coordination mode. In LW (CO) 5, when the ligand is L1, it tends to coordinate to the metal via imidazole nitrogen while L3 tends to react with the metal with pyridine nitrogen; in LW (CO) 4, the ligand L1 Appears as [N, N ’] bidentate ligands coordinated by imidazole nitrogen and pyrazole nitrogen atoms, while L2 and L3 appear as [N, N] bidentate ligands coordinated by a pyrazole nitrogen atom; (CO) 3, L1 and L2 function as [N, N, N ’] tridentate chelating ligands.