Synthesis and characterization of a stable bis-naphthyltin(II) compound.Bis[8-(dimethylamino)-1-naphthyl-C,N]tin(II) and its W(CO)5 adduct

Abstract

Reaction of [8-(dimethylamino)-1-naphthyl-C, N]lithium with SnCl{2} affords the new monomeric stannylene bis[8-(dimethylamino)-1-naphthyl-C,N]tin(II) (3). The reaction between W(CO){5}(NME{3}) and 3 yields {bis[8-(dimethylamino)-1-naphthyl-C,N]tin(II)} tungsten pentacarbonyl (4). The crystal structures of 3 and 4 have been determined by X-ray diffraction methods. 3: C{2}{4}H{2}{4}N{2}Sn, orthorhombic, space group Pbca with a 22.383(4), b 30.865(5), c 12.127(2) @9 and Z = 16, final R = 0.067 for 4983 observed reflections. 4: C{2}{9}H{2}{4}N{2}O{5}SnW, a 12.509(3), b 15.191(1), c 9.780(1) @9, @a 98.42(1), @b 104.33(1), @c 107.27(1)}o{, space group P1, Z = 2, triclinic; R = 0.046 for 7116 observed reflections. The geometry about tin in 3 is distorted @j-trigonal bypyramidal, and that in 4 is distorted trigonal bipyramidal. In both 3 and 4 the 8-(dimethylamino)-1-naphthyl groups are C,N-chelate bonded, with the C(1) atoms at equatorial sites and the nitrogen atoms at axial sites. The Sn lone pair in 3 and the W(CO){5} moiety in 4 occupy the remaining equatorial sites. }1{H, }1{}3{C, and }1{}1{}9{Sn solution NMR spectroscopic studies of 3 and 4 show that at low temperature (=< - 15}o{C) they retain the structures found in the solid state. At higher temperatures fluxional processes become operative.