A new light emitting material

2(salicylaldehyde with aniline)-(1

10-phenanthroline) calcium was synthesized.Its molecular structure

crystal structure

thermal stability and optical properties were investigated by FTIR spectra

XRD spectra

DSC thermal analysis

UV-vis spectra

fluorescence excitation spectrum and fluorescence spectrum

respectively.Its energy band and light emission mechanism were studied.Results show that 2(salicylaldehyde with aniline)-(1

10-phenanthroline) calcium is a thermally stable

polycrystalline material

whose melting point is about 325℃.In its infrared spectrum

a high intensity band is at about 1650 cm

-1

.This band is typical of the conjugated C=N stretching vibration

which shift to higher frequency in relation to the free ligand of salicylaldehyde with aniline.A very weak band at 1 248 cm

-1

is assigned to(ph-O) stretching vibration

which is weaker than that of the free ligand of salicylaldehyde with aniline.New band at 655 cm

-1

is assigned to Ca-O stretching vibration.Its ethanol solution can emits intense blue fluorescence with peak wavelength of 491 nm and its powder also emits intense blue fluorescence with peak wavelength of 449.7 nm under UV irradiation.The redshift of 41.3 nm of fluorescence peak wavelength of 2(salicylaldehyde with aniline)-(1

10-phenanthroline) calcium in ethanol solution relative to its powder state is caused by solvent effect.Its UV absorption bands are at about 222

258

325 and 388 nm

respectively.The absorption bands at about 222 nm and 258 nm are attributed to intrinsic absorption of benzene ring.The absorption band at about 325 nm and 388 nm are assigned to intrinsic absorption of C=N.Its optical gap is about 2.93 eV

which was determined by intrinsic absorption band edge of 2(salicylaldehyde with aniline)-(1

10-phenanthroline) calcium in ethanol solution.Its fluorescence excitation spectrum has two excitation bands located at(361.5 nm) and 409.5 nm

respectively.Its fluorescence originates chiefly from the long wavelength excitation band of 409.5 nm.