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The whole mol-ecule of the cadmium(II) complex, di-iodido-{ N , N ', N '', N '''-[pyrazine-2,3,5,6-tetra-yltetra-kis-(methyl-ene)]tetra-kis-( N -methyl-aniline)-κ 3  N  2 , N  1 , N  6 }cadmium(II), [CdI 2 (C 36 H 40 N 6 )], ( I ), of the ligand N , N ', N '', N '''-[pyrazine-2,3,5,6-tetra-yltetra-kis-(methyl-ene)]tetra-kis-( N -methyl-aniline) ( L ), is generated by a twofold rotation symmetry; the twofold axis bis-ects the cadmium atom and the nitro-gen atoms of the pyrazine ring. The ligand coordinates in a mono-tridentate manner and the cadmium atom has a fivefold CdN 3 I 2 coordination environment with a distorted shape. In the zinc(II) complex, dichlorido{ N , N ', N '', N '''-[pyrazine-2,3,5,6-tetra-yltetra-kis-(methyl-ene)]tetra-kis-( N -methyl-aniline)-κ 3  N  2 , N  1 , N  6 }zinc(II) di-chloro-methane 0.6-solvate, [ZnCl 2 (C 36 H 40 N 6 )]·0.6CH 2 Cl 2 , ( II ), ligand L also coordinates in a mono-tridentate manner and the zinc atom has a fivefold ZnN 3 Cl 2 coordination environment with a distorted shape. It crystallized as a partial di-chloro-methane solvate. In the crystal of I , the complex mol-ecules are linked by weak C-H⋯I contacts, forming ribbons propagating along [100]. In the crystal of II , the complex mol-ecules are linked by a series of C-H⋯π inter-actions, forming layers lying parallel to the (11) plane. In the crystals of both compounds there are metal-halide⋯π(pyrazine) contacts present. The Hirshfeld analyses confirm the importance of the C-H⋯halide contacts in the crystal packing of both compounds.

acta crystallographica. section e, crystallographic communications

The crystal structures and Hirshfeld surface analyses of a cadmium(II) and a zinc(II) mononuclear complex of the new tetrakis-substituted pyrazine ligand N,N′,N′′,N′′′-[pyrazine-2,3,5,6-tetrayltetrakis(methylene)]tetrakis(N-methylaniline)