Abstract
The new compounds, K6Mo3IICl12;
(NH4)7Mo3IICl13.H2O;
and Cs6Mo4Cl16 (containing molybdenum in
oxidation state +2.5) have been precipitated by the appropriate cation from solutions
of molybdenum(II) acetate in 12M hydrochloric acid. The absorption spectra of
potassium and ammonium salts are similar in the solid state and solution. Since
the compounds are strong reducing agents and short-lived in solution, their
formulation as a staphylonuclear (i.e. metal-clustered) trimer or tetramer
rests on their diamagnetism, stoicheiometry, and spectral similarities.
It is proposed that the chloromolybdates
adopt entirely novel, compact polymers by stacking the chlorine atoms into
"close packed" layers. The Mo3Cl13 group
consists of two layers of chlorine atoms (seven and six) generating three
octahedral locations for the molybdenum atoms at the corners of a regular
triangle. The Mo3Cl12 group is similar but deficient in
one chlorine atom. The Mo4Cl16 group is related to Mo3Cl13
and consists of three layers of chlorine atoms (seven, six, and three)
providing four octahedral locations for the molybdenum atoms at the corners of
a tetrahedron.
Cited by
26 articles.
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