A Fluoro-Chromogenic Sensor Based on Organic Molecular Framework for Cu 2+ and F - in Aqueous Soluble DMSO.

The 2,2'-dinaphtholazobenzene molecular framework (P) was designed, synthesized and characterized. Its absorption and fluorescence properties revealed that P is a dual sensor for copper ions (Cu2+ ) and fluoride ions (F- ) in DMSO. The colorimetric activities were clearly visible by naked eye upon the addition of the two ions. Fluorescence quenching and enhancement were observed when Cu2+ and F- ions were added respectively. Density Functional Theory (DFT) calculations were carried out to provide an insight into the interaction of guest ions (Cu2+ and F- ) with P, and to explain how the molecular orbitals were affected. Graphical Abstract ᅟ.