The Mo atoms in the title compounds, i.e. triethylammonium cis-tetrachlorob
is(4-ethylpyridine-N)molybdate(III), cis(C6H16 N)[MoCl4 (C7H9N)(2)], and tr
ans-tetrachlorobis(4-ethylpyridine-N)molybdenum(IV), trans-[MoCl4(C7H9N)(2)
], are six-coordinate with octahedral geometry. The Mo atom in the latter c
omplex lies on a site with crystallographic 2/m symmetry.