Synthesis and structural characterization of trans-[Mo2(H2DMepyF)2(CH3CN)4](BF4)6 (HDMepyF=N,N′-di(6-methyl-2-pyridyl)formamidine)
摘要:
Reaction of Mo-2(O2CCH3)(2)(DMepyF)(2) (HDMepyF = N,N'-di(6-methyl-2-pyridyl)formamidine) with HBF4 in CH2Cl2/CH3CN afforded the complex trams-[Mo-2(H(2)DMepyF)(2)(CH3CN)(4)](BF4)(6) (1), which crystallized in two forms, trans-[Mo-2(H(2)DMepyF)(2)(CH3CN)(4)](ax-CH3CN)(2)(BF4)(6) (.) 2CH(3)CN (1a), and trans-[Mo-2(H(2)DMepyF)(2)(CH3CN)(4)](ax-BF4) (2)(BF4)(4) (.) 2CH(3)CN (1b). The molecular structures of complexes (1) consist of two quadruply bonded molybdenum atoms, which are spanned by two trans-bridging formamidinate ligands and coordinated by four trans-CH3CN. Each H(2)DMepyF(-) ligand adopts an conformation. The difference between 1a and 1b is that complex ta contains two CH3CN molecules as axial ligands, while 1b contains two BF4- anions as axial ligands. Complex I is the first dimolybdenum complex containing a pair of trans bridging ligands and two pairs of trans-CH3CN ligands. (C) 2003 Published by Elsevier B.V.
摘要Mo2(O2CCF3)4和Mo2(O2C(CH2)nCH3)4与N,N'-二(6-甲基-2-吡啶基)甲form(HDMepyF)在CH2Cl2中的反应提供了Mo2(O2CCF3)2型配合物(DMepyF)2,1,和Mo2(O2C(CH2)nCH3)2(DMepyF)2(n = 0,2; n = 2,3; n = 5,4; n = 8,5; n = 14, 6)。它们的结构已经通过X射线晶体学确定。配合物1-6的分子结构由两个四重键合的钼原子组成,它们被两个反式桥接的form酰胺配体和两个反式桥接的羧酸酯配体所跨越。甲酰胺基配体通过两个中心氮原子以二齿形式与Mo中心配位,并且两个末端吡啶基环悬空。DMepyF-配体采用s-顺式,s-反式构象,导致Mo⋯N和Mo⋯HC短距离。