Biomolecules and nanostructures
The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
CHIRAL PYRROLO[1,2-A]QUINOLINES AS 2ND-ORDER NONLINEAR OPTICAL- MATERIALS
KELDERMAN E, VERBOOM W, ENGBERSEN JFJ, HARKEMA S, HEESINK GJT, LEHMUSVAARA E, VANHULST NF, REINHOUDT DN, DERHAEG L, PERSOONS A
CHEMISTRY OF MATERIALS
vol 4 issue 3: p626-p631 MAY-JUN 1992
The synthesis and nonlinear optical properties of a series of chiral pyrrolo[1,2-a]quinolines la-e is presented. The microscopic hyperpolarizabilities (beta(z)) were determined by EFISH measurements and the macroscopic susceptibilities (X2) were estimated by the Kurtz powder test. A small fixed angle of the annelated pyrrolidine donor unit with respect to the aromatic-pi-system renders the whole donor-pi-acceptor system chiral. The small deviation from planarity of approximately 10 +/- 3-degrees causes no observable reduction of the microscopic beta(z) value in comparison with the planar conjugated N,N- dimethylaniline analogues. The powder test showed phase matching for all pyrrolo[1,2-a]quinolines with an electron- withdrawing substituent at C-7 (1b-e). The aldehyde 1b crystallizes in the P2(1)2(1)2(1) space group and was calculated to have an efficiency of 8.3% of beta under optimal phasematch conditions. The nitro derivative 1c crystallizes in the favorable space group P2(1) (Z = 2) in which the angles of the two independent molecules with the optical b axis are 71.7- degrees and 43.5-degrees.