Crystal structures of the Lewis acid–base adducts {[(C6H11)2N]3Ti–LB}+[MeB(C6F5)3]−·1.5C7H8; LB = (C6H5)3PO (1), p-F—C6H4CN (2)

In the mol­ecular structures of the two title compounds, the central titanium(IV) atoms are coordinated in a distorted tetra­hedral fashion. Thereby, the titanium atom is stabilized by the Lewis bases tri­phenyl­phosphine oxide ( 1 ) and p -fluoro­benzo­nitrile (pFBN) ( 2 ) with dative O—Ti and N—Ti bonds, respectively. The reaction of [(C 6 H 11 ) 2 N] 3 Ti—CH 3 with the Lewis acid B(C 6 F 5 ) 3 , followed by addition of the Lewis bases (C 6 H 5 ) 3 PO and p -F—C 6 H 4 CN led to the complex salts tris­(di­cyclo­hexyl­amido)(tri­phenyl­phosphine oxide)titanium methyl­tris(penta­fluoro­phen­yl)borate toluene sesquisolvate, [Ti(C 12 H 22 N) 3 (C 18 H 15 OP)](C 19 H 3 F 15 B)·1.5C 7 H 8 , ( 1 ), and tris­(di­cyclo­hexyl­amido)(4-fluoro­benzo­nitrile)­titanium methyl­tris­(penta­fluoro­phen­yl)borate toluene sesquisolvate, [Ti(C 12 H 22 N) 3 (C 7 H 4 FN)](C 19 H 3 F 15 B)·1.5C 7 H 8 , ( 2 ), both crystallizing with 1.5 equivalents of toluene solvent mol­ecules. The Lewis acid–base adducts ( 1 ) and ( 2 ) can be described by dative donor bonds. The packing of the complex cations, anions and solvent mol­ecules in the crystal structure is consolidated by an intricate three-dimensional network of non-classical C—H⋯F inter­actions. Disorder of some of the cyclo­hexyl groups and the toluene solvent mol­ecules is observed.