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Three isomorphous 0-D hybrid salts, namely, 2-methylimidazo[1,5- a ]pyridinium trichloridoiodidozincate(II), (C 8 H 9 N 2 ) 2 [ZnCl 3.19 I 0.81 ] or [ L ] 2 [ZnCl 3.19 I 0.81 ], (I), 2-methylimidazo[1,5- a ]pyridinium dibromidodichloridocadmate(II), (C 8 H 9 N 2 ) 2 [CdBr 2.42 Cl 1.58 ] or [ L ] 2 [CdBr 2.42 Cl 1.58 ], (II), and 2-methylimidazo[1,5- a ]pyridinium trichloridoiodidocadmate(II), (C 8 H 9 N 2 ) 2 [CdCl 3.90 I 0.10 ] or [ L ] 2 [CdCl 3.90 I 0.10 ], (III), are assembled from discrete 2-methylimidazo[1,5- a ]pyridinium cations,  L + , and mixed-halide tetrahalometallate anions. In the three structures, there are two crystallographically non-equivalent cations that were modelled as being rotationally disordered by 180°. In the lattices of the three compounds, a disordered state exists involving partial substitution of Cl by I for sites 2–4 in (I), Br by Cl for all four sites in (II) and Cl by I for site 2 in (III). In the solid state, the organic and inorganic sheets alternate parallel to the  bc  plane in a pseudo-layered arrangement. In the organic layer, pairs of centrosymmetically related  trans -oriented cations form π-bonded chains. The adjacent tetrahalometallate anions in the inorganic layer show no connectivity with the shortest  M ... M  separations being greater than 7 Å. A variety of C—H... X — M  ( X  = Cl, Br, I) contacts between the organic and inorganic counterparts provide additional structural stabilization. The title structures are isomorphous with the previously reported structures of the chloride analogues, [ L ] 2 [ZnCl 4 ] and [ L ] 2 [CdCl 4 ].

Organic–inorganic hybrid mixed-halide ZnII and CdII tetrahalometallates with the 2-methylimidazo[1,5-a]pyridinium cation

Organic–inorganic hybrid mixed-halide Zn^II and Cd^II tetrahalometallates with the 2-methylimidazo[1,5-a]pyridinium cation