G. Lenoble et al., SYNTHESES, CRYSTAL-STRUCTURES, AND NLO PROPERTIES OF NEW CHIRAL INORGANIC CHROMOPHORES FOR 2ND-HARMONIC GENERATION, Inorganic chemistry, 37(9), 1998, pp. 2158-2165
A new chiral ligand (H2L) based on the condensation of diaminocyclohex
ane and 4-(diethylamino)salicylaldehyde is reported along with its nic
kel(II) and manganese(III) complexes. These compounds all crystallize
in noncentrosymmetric space groups. Crystal data are as follows. For t
he ligand(C28H40N4O2): monoclinic, I2, a = 15.487(2) Angstrom, b = 8.1
988(6) Angstrom, c = 20.958(3) Angstrom, beta = 95.92(1)degrees, Z = 4
. For the (NiL)-L-II complex: monoclinic, P2(1), a = 8.613(2) Angstrom
, b = 21.714(4) Angstrom, c = 15.870(4) Angstrom, beta = 91.02(2)degre
es, Z = 4. For the (MnLCl)-L-III complex: orthorhombic, P2(1)2(1)2(1),
a = 7.233(2) Angstrom, b = 15.159(3) Angstrom, c = 25.591(7) Angstrom
, Z = 4. The manganese derivative exhibits an efficiency 8 times that
of urea in second-harmonic generation at 1.9 mu m. INDO/SCI-SOS quantu
m-chemical calculations predict a sizable molecular nonlinear response
and an enhancement of the nonlinearity after metal complexation.