Syn- and anti-rotamers of the ortho-stereoisomer [Pt{(o-BrC₆F₄)N(CH₂)₂NEt₂}Cl(py)]

The crystal structure of the ortho -isomer trans -[ N -(2-bromo-3,4,5,6-tetrafluorophenyl)- N ′, N ′-diethylethane-1,2-diaminato(1−)]chloridopyridineplatinum(II), [PtBr 0.1 (C 12 H 14 BrF 4 N 2 )Cl 0.9 (C 5 H 5 N)][PtBr 0.4 (C 12 H 14 BrF 4 N 2 )Cl 0.6 (C 5 H 5 N)] or [Pt{( o -BrC 6 F 4 )N(CH 2 ) 2 NEt 2 }Cl(py)], 1 o , revealed syn and anti rotamers in a 1:1 ratio in the solid state. 1 o crystallizes in the centrosymmetric space group P 1 . The Pt-coordinated Cl ligand exhibits partial occupancy with Br, predominantly in the syn -rotamer. Notably, agostic interactions are observed between the Pt centre and a H atom of one of the ethyl groups. The ortho -isomer 1 o was successfully isolated as a side product from the reaction of [Pt{H 2 N(CH 2 ) 2 NEt 2 }Cl 2 ], Tl 2 CO 3 and C 6 F 5 Br. While the para -isomer [Pt{( p -BrC 6 F 4 )N(CH 2 ) 2 NEt 2 }Cl(py)], 1 p , is the main product, the higher solubility of 1 o facilitates its isolation.