Molecular structure of potassium [N,N?-bis(salicylideneamino)nitroguanidonate-N,N?,-O,O?]nickel(ii), the product of condensation of (salicylideneamino)nitroguanidine with salicylaldehyde on a Ni2+ ion template

NiIImolecular complex with a tetradentate aminoguanidine-derived Schiff base ligand: structural, spectroscopic and electrochemical studies and photoelectric response

“…To our knowledge, only one example of a Schiff base metal complex structurally similar to (I) has been reported. The reaction between (salicylideneamino)nitroguanidine and salicylaldehyde in the presence of Ni 2+ ions used as templating agents and K + cations produced potassium (N,N 0 -bis(salicylideneamino)-N 00 -nitroguanidinato-N,N 0 ,O,O 0 )nickel(II) with a cis-NiN 2 O 2 square-planar chromophore (TUFDAZ; Starikova et al, 1996). Obviously, the Ni II -assisted condensation of AG or its NO 2 -substituted analogue with two aldehyde molecules in the case of (I) and TUFDAZ occurred due to a combination of structural and electronic factors unique to the nickel(II) cation, which is prone to adopt a tetradentate square-planar geometry, and the favourable stoichiometry of the condensation reaction.…”

Synthesis and structural characterization of Cd(II) complexes with 2-acetylpyridine-aminoguanidine - a novel coordination mode

“…22 The survey of Cambridge Structural Database (CSD) 24 revealed 49 complex compounds containing Schiff bases of aminoguanidine. Namely, the majority of these contain the Schiff base coordinated in the tridentate manner (33 structures), while there are only 4 structures with the Schiff base of AG having the role of a tetradentate [25][26][27][28] and only 1 structure in which monodentate 29 coordination was found. In 11 structures the guanylhydrazone has…”