A series of eight 4-substituted 1-(adamantane-1-carbonyloxy) pyridine-2 (1 H)-thiones (1, X= H, OC7H15, Me, CF3, SC3H7, CN, COOMe, and Cl) was prepared and characterized by UV− vis spectroscopy in MeCN and cyclohexane. The observed lowest energy transition, designated as πCS→ π* ring, exhibits a substantial substituent effect and λmax ranges from 333 (X= OC7H15) to 415 nm (X= CN). Experimental λmax values for all esters except for ...
