How an Eight-Membered Ring Alters the Rhodamine Chromophore

J Org Chem. 2020 May 1;85(9):5973-5980. doi: 10.1021/acs.joc.0c00414. Epub 2020 Apr 15.

Abstract

Readily available phenylene-1,3-diamines can be converted into unprecedented analogues of rhodamine and malachite green possessing a central eight-membered ring in three steps. The overall process couples a cyanine chromophore with a urea bridge giving rise to new dyes possessing distinct spectral characteristics: absorption of orange light combined with a weak emission of red light both in solution and in the crystalline state. Their photophysics is governed by the twist of lateral phenyl rings and intramolecular and intermolecular CT transitions.

Publication types

  • Research Support, Non-U.S. Gov't