Structure cristalline du pentachloroformonitrileniobium(V)
Abstract
<h2>Acta Crystallographica Section B</h2><h3>Structural Crystallography and Crystal Chemistry</h3><h3>0567-7408</h3> <h2>research papers</h2> Volume 31 Part 7 Pages 1823-1827 July 1975 <h2>Structure cristalline du pentachloroformonitrileniobium(V)</h2> C. Chavant, G. Constant, Y. Jeannin et R. Morancho 1823 Acta Cryst. (1975). B31, 1823 Structure Cristalline du Pentachloroformonitrileniobium(V) BY C. CHAVANT, G. CONSTANT,* Y. JEANNIN~" ET R. MORANCHO* Laboratoire de Chimie de Coordination du CNRS, B.P. 4142, 31030 Toulouse Cedex, France (Refu le 9 janvier 1975, acceptd le 5 fdvrier 1975) Pentachloroformonitrileniobium(V), NbCIs(NCH), formed by addition of niobium pentachloride and hydrogen cyanide, crystallizes in the orthorhombic system: a= 12.075+0.006, b= 10.450+0.009, c = 6"551 + 0.004/~ and Z= 4; space group Pnma. 761 reflexions have been recorded at room temperature with a diffractometer. A least-squares refinement on F, inverting the full matrix and using anisotropic temperature factors, leads to an unweighted R value equal to 5.5 % if 93 zero reflexions are excluded. The niobium atom is octahedrally surrounded by five chlorine atoms and one hydrogen cyanide molecule which is bound to niobium by its nitrogen atom. In agreement with infrared results the length N---C, equal to 1.09 A, is shorter than in the free HCN molecule. Introduction Les pentahalog6nures de niobium et de tantale