Substituted thieno[3,2-b]thiophenes and their use

US5432286A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Ivan Cabrera · Dreieich, DE
• Uwe Falk · Könnern, DE
• Werner Hickel · Ludwigshafen, DE
• Donald Lupo · Frankfurt am Main, DE
• Ude Scheunemann · Bad Soden am Taunus, DE
• Peter Boldt · Braunschweig, DE
• Martin Blenkle · Braunschweig, DE

Key dates

• Filing date: Oct 7, 1993
• Grant date: Jul 11, 1995
• Expiry date: Oct 7, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/3618
• WIPO field: Micro-structural and nano-technology
• WIPO sector: Chemistry

Abstract

Substituted thieno[3,2-b]thiophenes, processes for their preparation and their use Compounds of the formula I ##STR1## in which R is a C.sub.1 - to C.sub.22 -alkyl radical, PA1 A.sup.1 and A.sup.2 are hydrogen or methyl or PA1 A.sup.1 is hydrogen and A.sup.2 is the nitro group, and PA1 B is the cyano group, the nitro group or an electron-attracting organic group having a double bond which is in conjugation with the thieno[3,2-b]thiophene ring system, have a high dipole moment and a high polarizability and are suitable for purposes of nonlinear optics. If R in the formula I is a C.sub.12 - to C.sub.22 -alkyl radical, monomolecular layers can be applied to a substrate by the Langmuir-Blodgett method. The resulting layer elements are suitable, inter alia, as waveguides.