Reactivity of [Re2(CO)8(MeCN)2] With 1-vinylimidazole: X-ray Structures of [Re2(CO)8{η 1-NC3H3N(CH=CH2)}2] and [ReCl2(CO)2{η 1-NC3H3N(CH=CH2)}2

Abstract

Treatment of [Re2(CO)8(MeCN)2] with excess 1-vinylimidazole in refluxing benzene gives three new compounds [Re2(CO)9{η 1-NC3H3N(CH=CH2)}] (1), [Re2(CO)8{η 1-NC3H3N(CH=CH2)}2] (2) and [ReCl2(CO)2{η 1-NC3H3N(CH=CH2)}2] (3) in 11, 32 and 2% yields, respectively. The solid-state structures of complexes 2 and 3 have been determined by single crystal X-ray diffraction studies. Compound 2 crystallizes in the monoclinic space group C2/c, with lattice parameters a = 13.8378(5) A, b = 11.8909(5) A, c = 14.4591(6) A, β = 116.6470(10)°, Z = 4 and V = 2131.99(15) A3. Compound 3 crystallizes in the monoclinic space group C2/c, with lattice parameters a = 10.1028(3) A, b = 13.5640(5) A, c = 12.5398(4) A, β = 109.637(2)°, Z = 4 and V = 1618.4(9) A3. The disubstituted dinuclear compound 2 contains two 1-vinylimidazole ligands coordinated through the imino nitrogen atoms at the equatorial sites, whereas the mononuclear compound 3 contains two carbonyl ligands, two N coordinated η 1-1-vinylimidazole ligands and two terminal Cl ligands. Two dinuclear complesxes [Re2(CO)9{η 1-NC3H3N(CH=CH2)}] (1) and [Re2(CO)8{η 1-NC3H3N(CH=CH2)}2] (2) and the mononuclear [ReCl2(CO)2{η 1-NC3H3N(CH=CH2)}2] (3) were obtained from the reaction of [Re2(CO)8(MeCN)2] with excess 1-vinylimidazole at 80 °C. The X-ray structrures of 2 and 3 are described.