The Effect of Steric Bulk on Coordination Sphere Geometry for BiCl3 Complexes with Bulky Heterocyclic Imidazolethione Ligands
Chemistry and Biochemistry
The synthesis and characterization of three new complexes, BiCl3(mipit)2 (1), BiCl3(emit)2 (2), and BiCl3(mnpit)2 (3) are reported, where emit = 1-ethyl-3-methyl-2(3H)-imidazolethione; mnpit = 1-methyl-3-(1-propyl)-2(3H)-imidazolethione; mipit = 1-methyl-3-(2-propyl)-2(3H)-imidazolethione. X-ray crystallog. results are reported for 1 and 3, the mipit and mnpit complexes whereas the structure of 2, the emit complex is under restudy because of disorder. BiCl3(mnpit)2 (3) crystallizes in a triclinic space group (P.hivin.1) with lattice parameters; a 9.4223(6), b 10.6275(6), c 12.8860(8) Å, α 108.329(1), β 90.388(1), γ 115.200(1)°, Z = 2. BiCl3(mipit)2 (1) crystallizes in a triclinic space group (P.hivin.1) with a 10.4347(8), b 11.0018(9), c 11.2075(9) Å, α 95.827(1), β 104.890(1), γ 117.064(1)°, Z = 2. Both complexes show the same pattern with two BiL2Cl4 (L = ligand) octahedra sharing a common edge through bridging chlorine atoms and the ligands occupying trans positions perpendicular to the plane made by the two bismuth atoms and six chlorine atoms. No strong evidence for a hemidirected lone pair is obsd. in either of the two complexes.