title: Spectral investigations on 1,5-dipiperidino anthraquinone.
abstract: Optical absorption, fluorescence emission and surface enhanced Raman spectra of 1,5-dipiperidino anthraquinone (1,5-DPAQ) have been examined to elucidate the nature of molecule in different environments. Fluorescence emission and optical absorption measurements show that the polarity of the solvent plays a vital role through intermolecular hydrogen bonding and reorientational motion of solvent molecule around excited state fluorophore. Anisotropy measurement gives the angle between absorption and emission transition dipoles. The vibrational features observed in surface enhanced Raman spectroscopy (SERS) suggest that the molecules are chemisorbed. The adsorption of the molecule is through pi electrons in the anthraquinone ring and the axial lone pair of electrons of nitrogen. The orientation of the molecule is found to be 'flat-on'.
authors.affiliation: Laser Laboratory, Department of Microprocessor and Computer, School of Physics, Madurai Kamaraj University, Madurai 625 021, India.
authors.forename: M
authors.initials: M
authors.lastname: Umadevi
authors.forename: V
authors.initials: V
authors.lastname: Ramakrishnan
mesh_terms: D000327:Adsorption; D016880:Anisotropy; D000880:Anthraquinones / Q000032:analysis* / Q000737:chemistry; D006860:Hydrogen Bonding; D008956:Models, Chemical; D009584:Nitrogen / Q000737:chemistry; D010880:Piperidines / Q000032:analysis* / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013059:Spectrum Analysis, Raman
chemical_list: C475680:1,5-dipiperidino anthraquinone; D000880:Anthraquinones; D010880:Piperidines; D009584:Nitrogen