Two new organic chromophores containingfuran ring as a conjugation bridge located near the donor have been synthesized and characterized by X-ray single crystal structure determination. Their first molecular hyperpolarizability (β) are measured by Hyper-Rayleigh Scattering (HRS) technique.
已经合成了两种含有呋喃环作为位于供体附近的共轭桥的新型有机发色团,并通过 X 射线单晶结构测定对其进行了表征。它们的第一个分子超极化 (β) 是通过超瑞利散射 (HRS) 技术测量的。
Synthesis of novel sulfonyl-substituted pyrrole chromophores for second-order nonlinear optics
作者:Shang-Shing P Chou、Yu-Hsin Yeh
DOI:10.1016/s0040-4039(00)02232-2
日期:2001.2
The first synthesis of sulfonyl-substituted pyrrole chromophores 1–4 and their UV–vis absorptions, second-ordernonlinear optical properties and thermal stability are described and compared with those of the benzene, thiophene and furan analogues 5–9.
Selective metal-free amination and Diels-Alder reactions are described in the furan series, leading to polysubstituted anilines or to stable oxabicyclic adducts in high yield. Interestingly, anilines are conveniently prepared through a novel one-pot, two-step amination/Diels-Alder procedure from commercially available 5-bromo-2-furaldehyde.
The title compound, C18H17N3O2, belongs to a series of large conjugated molecules with potential use as organic dyes. As indicated by the planarity of the molecule and the pattern of bond lengths and angles, a considerable amount of pi-electron density is transferred from the aminofuran portion of the molecule to the cyano and benzoxazolyl groups. This fact is supported by the packing of the molecules in the crystal.