Coordination polymers based on aluminum and indium halides together with pyrazine

Four structurally closely related one-dimensional coordination polymers (CPs) have been synthesised, constituted by pyrazine (pyz) and the group 13 metal halides AlCl3, AlI3, InBr3, and InI3. Three CPs are isotypic: (l)(infinity)[AlCl3 (pyz)], (l)(infinity)[AlI3 (pyz)], (l)(infinity)[InBr3(pyz)]. Alike (l)(infinity)[InI3(pyz)], they form linear chains. Hereby, each M3+ ion is trigonal-bipyramidally coordinated by three halido ligands and two N-atoms of two pyz serving as linear nodes with twofold connectivity (2-c). The CPs were characterised by SCXRD, PXRD, elemental-analysis, simultaneous DTA/TG and IR-spectroscopy. In addition, two complexes [(ACl(3))(2)(pyz)(5)] and [(InI3)(2) (pyz)] with octahedrally coordinated Al3+ and unprecedented tetrahedrally coordinated In3+ ions were structurally characterised by SCXRD.