Side-on Dinitrogen Complexes of Titanocenes with Disubstituted Cyclopentadienyl Ligands: Synthesis, Structure, and Spectroscopic Characterization
作者:Scott P. Semproni、Carsten Milsmann、Paul J. Chirik
DOI:10.1021/om300156z
日期:2012.5.14
activated μ3,η2,η1,η1-N2 ligand with an N–N distance of 1.320(3) Å. Hydrogenation of the isomeric titanocene dimethyl complex, (η5-C5H3-1,2-Me2)2TiMe2, in the presence of dinitrogen did not result in N2 coordination but rather furnished the bimetallic titanium compound, (η5-C5H3-1,2-Me2)2Ti(μ2-H)Ti(η5-C5H3-1,2-Me2)(η5,η1-C5H2-1,2-Me2), resulting from C–H activation of a cyclopentadienyl ring position. Addition
所述1,3-二取代二茂钛络合物的还原,(η 5 -C 5 H ^ 3 -1,3-我镨2)2 TII或外消旋,内消旋- (η 5 -C 5 H ^ 3 -1-我PR-3 -Me)2 TII,具有N下过量0.5%钠汞齐2气氛提供的相应的二茂钛化合物二氮,[(η 5 -C 5 H ^ 3 -1,3-我镨2)2的Ti] 2(μ 2, η2,η 2 -N 2)和[(η 5 -C 5 H ^ 3 -1-我PR-3-Me)中的Ti] 2(μ 2,η 2,η 2 -N 2)。对这两种分子的晶体学研究表明,[N 2 ] 2-配体侧向结合,其N–N距离分别为1.226(5)和1.216(5)Å。可变温度磁化率研究确定了环境温度下三重态基态的种群,其能量略高于单重态。减少1,3-环戊二烯基的取代基的大小,以甲基,[(η 5 -C 5ħ 3 -1,3-ME 2)2的Ti],导致结晶的三金属钛二氮复合物与活化μ 3,η