Synthesis and properties of bis[N-R-(5-chloro-.alpha.-phenyl-2-hydroxybenzylidene)aminato]copper(II) complexes and crystal and molecular structures of the derivatives with R = n-butyl and R = isobutyl (two structural isomers)

Bis(5-chloro-N-isopropylsalicyldenaminato-κ2N,O)copper(II)

“…Structural phase transition, that is, transformation from a low-temperature phase (square planar or compressed tetrahedral) to a high-temperature phase (tetrahedral), occurs by heating up to $400 K (Arai et al, 1972). Comparative studies of crystal structures have been reported for two isomers (Chia et al, 1977) or speci®c phases, such as the brown form (Tamura et al, 1977) and the green form (Tamura et al, 1980). The reasons for structural regulation are complicated; tetrahedral distortion may be caused by a less hindered amine moiety (Cheeseman et al, 1965) as well as a bulky one (Fernandez et al, 2000).…”

Spectroscopic, structural and magnetic studies of nickel(II) complexes with tetra- and pentadentate ligands

“…The bond distances are Ni(1)-N(12) 1.851(4) Å , Ni(1)-N(19) 1.897(4) Å , which are comparable with analogous square planar nickel(II) complexes [25]. The imine double bond distances N 9 =C 8 1.297(7) Å and N 12 =C 13 1.290(7) Å suggest that the electronic effects on the imine double bonds are more important than the geometric factors in case of 1 [26,27].…”

Bis[2-methoxy-6-(3-pyridylmethyliminomethyl)phenolato-κ2N,O]copper(II)

“…candidate metal complexes is to examine compounds that show any changes between two or more states, such as structural phase transitions, isomerism, mixed valences and spin-crossover. In this respect, bis-(N-alkysalicylideneimine)copper(II) complexes have potential for induced structural phase transitions (Yamada, 1999) and the structural isomers can be isolated (Chia et al, 1997).…”

“…For recent developments in functional switching materials, see: Sato et al (2003). Bis-(N-alkysalicylideneimine)copper(II) complexes for induced structural phase transitions, see: Yamada (1999), and the structural isomers can be isolated, see: Chia et al (1997). For related metal complexes containing Schiff bases, see: You & Zhu (2004).…”