Crystal and molecular structures of µ-hydrido-bis[fac-(2,2′-bipyridine)-tricarbonylrhenium(I)]chloride, fac-(2,2′-bipyridine)tricarbonyl-formatorhenium(I), and fac-(2,2′- bipyridine)tricarbonyl(cyanotri-hydroborato)rhenium(I)

Abstract

The crystal and molecular structures of the compounds [Re₂(bipy)₂(CO)₆(µ-H)]Cl (1), fac-[Re(bipy)(CO)₃(HCO₂)](2), and fac-[Re(bipy)(CO)₃{BH₃(CN)}](bipy = 2,2′-bipyridine) have been determined by the heavy-atom method from three-dimensional X-ray data collected by counter methods. Compound (1) is triclinic and crystallizes in space group P, Z= 2, with cell constants a= 18.848(9), b= 10.171(5), c= 8.449(4)Å, α= 113.20(5), β= 85.96(5), and γ= 99.11(5)°; (2) is monoclinic and crystallizes in space group P2₁/c, Z= 4 with a= 15.002(5), b= 10.889(4), c= 8.819(4)Å, and β= 105.2(5)°; (3) is triclinic and crystallizes in space group P, Z= 2, with a= 16.313(8), b= 8.386(5), c= 6.661(4)Å, α= 85.70(6), β= 98.08(6), and γ= 100.46(6)°. Complex (1) comprises two Re(bipy)(CO)₃ units, linearly bonded by an hydrogen atom. The Re ⋯ Re distance between the two moieties is 3.49 Å. The structures of (2) and (3) exhibit the same half octahedron Re(bipy)(CO)₃ axially bonded respectively to HCO₂^– and BH₃(CN)^–.