Isolation and Characterisation of 2-Tert-butyl-8-hydroxyquinoline as a Crystalline Solid and Its Blue Fluorescent Li Complex

Table 1

Melting points, HOMO-LUMO values, band gaps, and photoluminescence of Li-8-hq, Li-2-Me-8-hq, and Li-2-TB-8-hq.

Compound	Melting point/°C^a	HOMO/eV^b	LUMO/eV^b	𝐸𝑔/ev^c	Emission maximum/nm
Li-8-hq^s	362	−5.00	−2.08	2.92±0.04	491±2
Li-2-Me-8-hq^s	397	−5.60	−2.60	3.00±0.03	485±2
Li-2-TB-8-hq^s	>400	−5.86	−2.82	3.04±0.02	475±2

aFrom DSC. bObtained from cyclic voltammetry in 1 mM analyte, supporting electrolyte 0.1 M tetrabutylammonium tetrafluoroborate in dichloromethane. Pt working and Pt auxiliary electrodes and Ag/AgCl (reference electrode). cDetermined from the absorption edge of vacuum thermal evaporated thin films. sPurified by vacuum sublimation.