849406-33-3Relevant academic research and scientific papers
Synthesis, crystal structures, and nonlinear optical (nlo) properties of new schiff-base nickel(ll) complexes. toward a new type of molecular switch?
Costes, Jean Pierre,Lamere, Jean Francois,Lepetit, Christine,Lacroix, Pascal G.,Dahan, Francoise,Nakatani, Keitaro
, p. 1973 - 1982 (2005)
An H2L Schiff-base ligand that was obtained from the monocondensation of diaminomaleonitrile and 4-(diethylamino)salicylaldehyde is reported together with four related nickel(ll) complexes formulated as [Ni(L)(L )] (L = MePhCHNH2, 'PrNH2, Py, and PPh3). Crystal structures have been solved for H2L, [Ni(L)(MePhCHNH 2)], and [Ni(L)(1PrNH2)]. Surprisingly, the complexation process leads to the formation of a rather unusual nickel amido (-NH-Ni) bond by deprotonation of the primary amine of H2L. A reduction of the quadratic hyperpolarizability (ss) from 38 x 10 -30 to 17.5 x 10-30 cm5 esu-1 is evidenced on H2L upon metal complexation by the electric-field- induced second-harmonic (EFISH) technique. Qualitative ZINDO/SCI quantum chemical calculations indicate that, in [Ni(L)(MePhCHNH2)], the ss orientation strongly depends on the laser wavelength. In particular, a ss rotation strictly equal to 90° could be obtained with 1.022 μm incident light on passing from [Ni(L)(MePhCHNH2] to a hypothetical [Ni(HL)(MePhCHNH2]+ protonated complex, thus raising the possibility for a new type of molecular switch.
