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Single crystals of CoCl 2 (pyz) 2  were prepared for the first time by sol-gel technique using pyrazine in tetramethoxysilane (TMOS) as the gel-forming reagent. The red polymeric Co(II) complex crystallizes in the orthorhombic space group  Ccca  with lattice parameters  a  = 10.100(1) Å,  b  = 10.672(1) Å,  c  = 10.136(1) Å and  Z  = 4 formula units, which is in contrast to its former structural description in the tetragonal system. The structure consists of infinite Co(pyz) 2  layers parallel (010) with a square planar Co-N 4  coordination completed to a nearly undistorted square bipyramide by the two chloro ligands.

Kristallzucht und Neubestimmung der Kristallstruktur von μ -Pyrazinokobalt(II)-chlorid, CoCl 2 (pyz) 2