⁵¹V NMR Study of VOCl₃ Immobilized
on the SiO₂ and MgCl₂ Surface

O. B. Lapina*, M. A. Mats’ko**, T. B. Mikenas*, V. A. Zakharov*,
E. A. Paukshtis*, D. F. Khabibulin**, and A. P. Sobolev*

* Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia

** Novosibirsk State University, Novosibirsk, 630090 Russia

Received February 28, 2000

Abstract—The magnetic shielding tensor and quadrupole interaction parameters, as well as the mutual orien-
tation of tensors for the (SiO)VOCl₂ complex obtained by the immobilization of VOCl₃ on the SiO₂ surface
are determined. The state of VOCl₃ on the surfaces of MgCl₂ and modified SiO₂ with all surface OH groups
replaced by Cl atoms is studied. To prepare the modified SiO₂, CCl₄ and SiCl₄ are used as chlorinating agents.
The formation of structurally similar pentavalent vanadium complexes on the surface of these supports is
shown. A model for the coordination environment of vanadium on the chlorine-containing supports is proposed.
The vanadium atom exists in the distorted pentahedral environment and is bound to the support through either
two chlorine atoms or chlorine and oxygen atoms. A correlation between the coordination of VOCl₃ and cata-
lytic properties of VOCl₃/MgCl₂ is assumed.

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