Tetranuclear Nickel(II) Complex with an Unsymmetrical Pentadentate Schiff-base Ligand Having a Defective Double-Cubane Core

Nickel(II) Complex Derived from Unsymmetrical α-(2-Hydroxy-3-salicylideneaminopropyl)iminopropionic Acid

“…In the synthesis of [Ni4(asp)2(CH3O)2(CH3OH)2], we used nickel(II) perchlorate hexahydrate in place of nickel(II) nitrate hexahydrate for the present case without the addition of water. 8 In this complex, one hydroxyl group of H3hsaip is not deprotonated and the Ni1 atom takes a square-planar geometry with phenolato-oxygen O1, imino-nitrogen N1, imino-nitrogen N2, and carboxylato- (Table 2), which are within the observed ranges for squareplanar nickel(II) complexes. 4,10 In the crystal, the alcohol group of Hasp' forms a hydrogen bond with the carboxylato-oxygen atom (O4) of the neighbor molecule [O2-H2···O4 (1-x, 1-y, 2-z) 2.732(6)Å] (Fig.…”

“…We successfully synthesized an unsymmetrical ligand, 1-acetylacetoneimine-3-salicylideneamino-2-propanol (H3asp), and its nickel(II) complex as a tetranuclear nickel(II) complex, [Ni4(asp)2(CH3O)2(CH3OH)2]. 8 During the course of this investigation, we found that another nickel complex with a different organic ligand (H3hsaip) from H3asp was isolated as brown crystals, when metalation for H3asp was performed in the presence of water. Here we report on the crystal structure of [Ni(Hhsaip)] (1) (Fig.…”

An Unprecedented Dodecanuclear Copper(II) Complex Derived from an Unsymmetrical Schiff‐Base Ligand

“…It is to be noted that all the di‐Schiff bases of 1,3‐diamino‐2‐propanol used to form complexes with Cu(II) are symmetrical. However, their unsymmetrical analogues in which two carbonyl compounds are different, are extremely rare and till date only one di‐ and one tetra‐nuclear Ni(II) complexes are reported with such N 2 O 3 donor unsymmetrical ligand, prepared by the condensation of 1,3‐diamino‐2‐propanol with salicylaldehyde and acetylacetone by high dilution method [6a,b] . Another Ni(II) complex of an unsymmetrical Schiff base of this diamine is reported but that ligand is obtained by monocondensation [6c] .…”

Dinuclear Assembly in a Copper(II) Complex with 1,3-Bis(pyrrole-2-methylideneamino)-2-propanol

“…[1][2][3][4][5][6] Recently, we isolated a nickel(II) complex with a compartmenttype Schiff-base ligand containing a pyrrole group, 1,3-bis(pyrrole-2-methylydeneamino)-2-propanol (H3bpmp), [Ni(Hbpmp)]·0.5CH3OH, which was thought to be interesting compared with a biologically important imidazole derivative ligand.7 X-ray crystallographic work revealed a mononuclear structure with a square-planar arrangement of the nickel(II) ion with a partially deprotonated Schiff-base ligand. In this study, we prepared a copper(II) complex with H3bpmp, [Cu(Hbpmp)]· 0.5C2H5OH ( Fig.…”