Oxidation of tellurium by high oxidation state fluorides in acetonitrile

55 145 OXIDATION FLUORIDES

OF TELLURIUM BY HIGH OXIDATION IN ACETONITRILE

Nashunmenghe Department

Bao, Laurence of Chemistry,

Elemental temperature similar

analyses,

of Glasgow,

Glasgow

G12 8QQ (U.K.)

by either MoFG or UF6 in MeCN at ambient

is oxidised

Bromine

M = MO or U [l].

I

under

by UF6 to give [Me-E=N-(Me)C=N-(Me)C=N-Br]

is formed by oxidation

-

A third type

’ Br is bound to a -C=N- trimer [2].

'positive

The

of Te using either MoF6 or UF6.

are crystalline solids which are formulated on the basis of their 125 Te n.m.r., vibrational and electronic spectra as

[TeF3(NCMe)2][MF6], between

University

12 is oxidised

conditions

products

and John M. Winfield

to give solid [I(NCMe)2][MF6],

[UF6] in which of cation

McGhee

STATE

3MF5.NCMe,

MO or W metals

M = MO or U.

of the Te-containing

strong oxidising

agents

is limited

mediate

behaviour

established

agents

to the formation

Although

salts.

in acidic media

are weak oxidising

species

reactions

and MoF6 or WF6 to give MF5.NCMe

characterisation

AsF5.NCMe

Similar

in MeCN. 2+

Oxidation

G.M. Anderson L. McGhee, (1987).

and J.M.

3

e.g. T.A. O'Donnell,

D.S. Rycroft

Winfield,

J.Chem.

and

of Te by these shows inter-

ability experimentally

in MeCN is UFG > MoF8 > NO+ > SbF5.NCMe,

2

SbF5NCMe

The NO+ cation

.

hence the order of oxidising

1

and this aided the SbF5 and AsF5 are

[3], the complexes

of Te4

occur

AsF5.NCMe.

Sot., Dalton Trans.,

and J.M. Winfield,

J. Fluorine

Chem. Sot. Rev., 16, 1 (1987).

337 (1986).

Chem., 36, 351