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Two new mononuclear metal complexes involving the bidentate Schiff base ligand 2,4,6-trimethyl- N -[(pyridin-2-yl)methyl-idene]aniline (C 15 H 16 N 2 or PM-TMA), [Mn(NCS) 2 (PM-TMA) 2 ] ( I ) and [Ni(NCS) 2 (PM-TMA) 2 ] ( II ), were synthesized and their structures determined by single-crystal X-ray diffraction. Although the title compounds crystallize in different crystal systems [triclinic for ( I ) and monoclinic for ( II )], both asymmetric units consist of one-half of the complex mol-ecule, i.e. one metal(II) cation, one PM-TMA ligand, and one N-bound thio-cyanate anion. In both complexes, the metal(II) cation is located on a centre of inversion and adopts a distorted octa-hedral coordination environment defined by four N atoms from two symmetry-related PM-TMA ligands in the equatorial plane and two N atoms from two symmetry-related NCS - anions in a trans axial arrangement. The tri-methyl-benzene and pyridine rings of the PM-TMA ligand are oriented at dihedral angles of 74.18 (7) and 77.70 (12)° for ( I ) and ( II ), respectively. The subtle change in size of the central metal cations leads to a different crystal packing arrangement for ( I ) and ( II ) that is dominated by weak C-H⋯S, C-H⋯π, and π-π inter-actions. Hirshfeld surface analysis and two-dimensional fingerprint plots were used to qu-antify these inter-molecular contacts, and indicate that the most significant contacts in packing are H⋯H [48.1% for ( I ) and 54.9% for ( II )], followed by H⋯C/C⋯H [24.1% for ( I ) and 15.7% for ( II )], and H⋯S/S⋯H [21.1% for ( I ) and 21.1% for ( II )].

acta crystallographica. section e, crystallographic communications

Crystal structures and Hirshfeld surface analysis oftrans-bis(thiocyanato-κN)bis{2,4,6-trimethyl-N-[(pyridin-2-yl)methylidene]aniline-κ2N,N′}manganese(II) andtrans-bis(thiocyanato-κN)bis{2,4,6-trimethyl-N-[(pyridin-2-yl)methylidene]aniline-κ2N,N′}nickel(II))