| Abstrakt: |
The synthesis of C3-symmetric chromophores (2–4, 9, 10, 14) with acceptor-substituted catecholato ligands and different central metal atoms (Si, Al, Ti) is described. These complexes might serve as octupolar chromophores with first-order nonlinear optical properties. UV/Vis spectroscopic investigations show a red-shift of the lowest-energy charge-transfer band on going from SiIV, AlIII to TiIV complexes, dependent on the increasing ionic character of the M–O bond. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) |
Plný text