A dramatic heavy-atom effect in the quenching of dichlorosubstituted lucigenin fluorescence

• DOI: 10.1016/j.cplett.2009.12.049
• Publication Date: 2009-12-22T09:08:13Z
• Authors: Eamonn F. Healy; Samuel Manzer; Jeffrey Gorman; Alicia Jones; Nicholas Cristea
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract A dichloro derivative of lucigenin has been synthesized and found to exhibit almost no fluorescence. Calculations using the graphical unitary group approach (GUGA), as implemented in the G amess program suite and using the full Brett-Pauli spin–orbit operator yields unusually large spin–orbit coupling (SOC) values. Comparison with experimental and theoretical results for similar systems identify the intramolecular heavy-atom effect (HAE) observed for chlorine in this system to be comparable to that observed for bromosubstituted polyaromatics in earlier studies.