Methanol[1-(meth­oxy­methanimido­yl)-2-(pyridin-2-ylmeth­yl)guanidine]bis(perchlorato)copper(II)

The title complex, [Cu(ClO₄)₂(C₉H₁₃N₅O)(CH₃OH)], was synthesized from a methanolysis reaction of N-(methyl­pyri­din-2-yl)cyano­guanidine (L³) and copper(II) perchlorate hexa­hydrate in a 1:1 molar ratio. The Cu^II ion is six-coordinated by an N₃O₃ donor set which confers a highly distorted and asymmetric octa­hedral geometry. Three N-donor atoms from the chelating 1-(meth­oxy­methanimido­yl)-2-(pyri­din-2-ylmeth­yl)guanidine (L^3m) ligand and one O atom from the methanol mol­ecule define the equatorial plane, with two perchlorate O atoms in the apical sites, one of which has a long Cu—O bond of 2.9074 (19) Å. The dihedral angle between the five- and six-membered chelate rings is 8.21 (8)°. Two molecules are associated into a dimeric unit by inter­molecular N—H...O(perchlorate) hydrogen bonds. Additionally, the weakly coordinated perchlorate anions also link adjacent [Cu(ClO₄)₂(L^3m)(CH₃OH)] dimers by hydrogen-bonding inter­actions, resulting in a two-dimensional layer in the (100) plane. Further C—H...O hydrogen bonds link the two-dimensional layers along [100] to generate a three-dimensional network.

1,3-Ninhydrin dihydrazone featuring an R₄⁴(12) motif with symmetry and comprising only N and H atoms

In the title compound [systematic name: (1Z,3Z)-1,3-di­hydra­zin­yl­idene-1H-inden-2(3H)-one], C₉H₈N₄O, isolated mol­e­cules possess approximate noncrystallographic C_2v symmetry and their cis conformation and planarity are assisted by a pair of short intra­molecular N-H...O hydrogen bonds. Each mol­ecule is asymmetrically involved in an extensive three-dimensional network of N-H...O and N-H...N hydrogen bonds, and the structure also exhibits weaker [pi]-[pi] and C=O...C inter­actions. The structure features an R₄⁴(12) motif consisting solely of N and H atoms and possessing crystallographic symmetry.