Study Of Near Infrared Squarylium Dyes On Synthesis And Spectroscopic Properties

Squarylium dyes are a kind of near infrared dyes which have very important application in the laser protection,electron photography,optical recording and so on.Three kinds of squarylium dyes are successfully synthesized in this dissertation.Their stuctures were characterized by the Infrared Spectrum and Nuclear Magnetic Resonance Spectrum.And the near infrared absorption performance were measured by the Ulraviolet-Visible-Near Infrared Spectrum device. The results revealed: 2(dihydroperimidine) squar-ylium dyes(A)showed strong absorbency in the range of 780-820nm wavelength, 3(dihyr-operimidine) squarylium dyes(B)showed strong absorbency in the range of 900-1000nm wavelength 4(dihydroperimidine) squarylium dyes (C) showed strong absorbency in the range of 1050-1 l00nm wavelength;The ThermoGravimetry analysis showed three kinds of compounds had good thermostability.The solubility measurement indicated they had good solubility in general solvent. Obviously three kinds of squarylium dyes had the huge application potential.