Ionic complex of a rhodamine dye with aggregation-induced emission properties

Faraday Discuss. 2017 Feb 22:196:177-190. doi: 10.1039/c6fd00146g.

Abstract

An AIE-active rhodamine based luminogen was prepared via a complexation reaction between non-emissive rhodamine hydrazide (RdH) and bulky camphorsulfonic acid (CSA). Besides acting to open the spirolactam ring of RdH, CSA also imposes a rotational restriction on the resultant ionic complex, RdH(CSA)x. Without CSA, the analogous complex RdH(HCl)3 is a luminogen with aggregation-caused quenching (ACQ) properties. The ionic bonds of RdH(CSA)3 are sensitive to several external stimuli and therefore it is a luminescent sensor for metal ions, organic amines and the blood protein bovine serum albumin (BSA). Besides being a sensor for BSA, the ionic RdH(CSA)3 is also a denaturant capable of uncoiling the peptide chain of BSA.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amines / analysis*
  • Animals
  • Cattle
  • Fluorescent Dyes / chemical synthesis
  • Fluorescent Dyes / chemistry*
  • Ions / chemical synthesis
  • Ions / chemistry
  • Metals / analysis*
  • Molecular Structure
  • Rhodamines / chemical synthesis
  • Rhodamines / chemistry*
  • Serum Albumin, Bovine / analysis*

Substances

  • Amines
  • Fluorescent Dyes
  • Ions
  • Metals
  • Rhodamines
  • Serum Albumin, Bovine