367251-64-7Relevant academic research and scientific papers
Synthesis and x-ray crystal structure determination of new zwitterionic complexes of titanocene
Burlakov,Arndt,Baumann,Spannenberg,Rosenthal,Letov,Lyssenko,Korlyukov,Strunkina,Minacheva,Shur
, p. 4072 - 4079 (2001)
The reaction of (η5-iPrC5 H4)2Ti(Me3SiC2SiMe3) (2) with B(C6F5)3 in toluene at room temperature produces the zwitterionic titanium(III) complex (η5-iPrC5H4)[η5- {1,3-iPrC5H3B-(C6 F5)3}]Ti (3) in which the 3-hydrogen atom of one of the C5 rings is substituted by a B(C6F5)3 group. The complex is analogous in its structure to the previously described titanium(III) zwitterion Cp[η5-C5H4B(C6 F5)3]Ti (1) formed in the interaction of B(C6F5)3 with Cp2Ti(Me3-SiC2SiMe3). A characteristic feature of both zwitterionic complexes is the presence of coordinative bonds between the ortho-fluorine atoms of two C6F5 substituents and the positively charged titanium center. Complex 1 is also obtained by the reaction of B(C6F5)3 with Cp2Ti(PhC2SiMe3). The oxidation of 1 and 3 by air oxygen affords the zwitterionic titanoxanes {Cp[η5-C5H4B(C6 F5)3]Ti}2O (5), respectively, which contain two zwitterionic units in the molecule. In each of these units, only one ortho-fluorine atom of a B(C6F5)3 group is involved in the coordination to the titanium atom. Complex 1 readily reacts also with acetone to give the zwitterionic adduct Cp[η5-C5H4B(C6 F5)3]Ti(Me2CO) (6), wherein the molecule of acetone is bonded to the Ti(III) center through the oxygen atom. In this adduct too, only one ortho-fluorine atom of a B(C6F5)3 group is coordinated to the metal.
