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

The title complex, [Cu(ClO(4))(2)(C(9)H(13)N(5)O)(CH(3)OH)], was synthesized from a methanolysis reaction of N-(methylpyridin-2-yl)cyanoguanidine (L(3)) and copper(II) perchlorate hexahydrate in a 1:1 molar ratio. The Cu(II) ion is six-coordinated by an N(3)O(3) 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.

Bis(1-carbamimidoyl-2-ethyl-isourea)copper(II) dinitrate.

The copper(II) complex, [Cu(C(4)H(10)N(4)O)(2)](NO(3))(2) or [Cu(L(1e))(2)](NO(3))(2), where L(1e) is 1-carbamimidoyl-2-ethyl-isourea, was obtained from a 1:2 molar ratio of copper(II) nitrate hemipenta-hydrate with 2-cyano-guanidine in ethanol. The crystal structure consists of the centrosymmetric [Cu(L(1e))(2)](2+) cation and two NO(3) (-) counter-anions. The cation exhibits four-coordinate bonding of the two N,N-bidentate ligands and the Cu(II) atom through the N-donor atoms, yielding a square-planar CuN(4) geometry.

Bis(1-carbamimidoyl-2-ethyl-isourea)copper(II) bis-(perchlorate).

The title complex, [Cu(C(4)H(10)N(4)O)(2)](ClO(4))(2) or [Cu(L(1e))(2)](ClO(4))(2), where L(1e) is 1-carbamimidoyl-2-ethyl-isourea, was obtained from the ethano-lysis reaction of 2-cyano-guanidine and copper(II) perchlorate hexa-hydrate in a 2:1 molar ratio. The two bidentate L(1e) ligands are coordinated to the Cu(II) center through N-donor atoms, leading to the CuN(4) chromophore. The Cu(II) environment is slightly distorted square-planar, with a dihedral angle of 5.