Structural and Preparative Studies of WX₄L₂ (X = Cl, Br; L = Pyridine, 4‐methylpyridine) and crystal structure of WCl₄Py₂

Abstract

Abstract WCl 4 Py 2 (Py = Pyridine) crystallizes in the monoclinic space group: I2/m, with a = 7.237(1), b = 7.278(2), c = 12.865(4) Å, β = 94.60(2)°, and Z = 2. WCl 4 Py 2 has 2/m crystallographic symmetry requiring trans position of the ligands. WCl and WN bond lengths are 2.347(1) and 2.181(4) Å. WCl 4 Py 2 is isostructural with WBr 4 Py 2 . WX 4 Pic 2 (Pic = 4‐methylpyridine) can be obtained from WX 4 Py 2 and 4‐methylpyridine at room temperature. Chemical and physical evidence speaks for the trans structure of WX 4 Pic 2 .