Jian-Quan Guo

Crystal structure of MSIA and photochromism of Eu3+–MSIA–phen complex

Abstract The title compound N,N-bis(N-methylenesuccimido) β-alanine (MSIA) was synthesized through the Mannich reaction of succimide with β-alanine in the formaldehyde solution. The structure of MSIA was determined by single crystal X-ray diffraction. The molecule has two five-membered rings with a dihedral angle of 74.45° instead of 180° in the same plane. The chain of β-alanine chooses the serrated conformation rather than linear one. Its Eu3+ complex with 1,10-phenanthroline(phen) has good photochromism in aqueous media.

Photocurrent generation of a novel chromoionophore combining D–π–A dye and aza-15-crown-5 ether in LB monolayer films

A novel amphiphilic chromoionophore, N-[4-(2,3,6,7,8,9,11,12-octahydro-5H-1,4,10,13,7-benzotetraoxaazacyclopentadecin-7-yl)butyl]-4-{2-[4-(N-methyl-N-hexadecylamino)phenyl]ethenyl}quinolinium bromide (Crown D), containing a D–π–A styryl dye and an aza-15-crown-5 ether group was synthesized, and successfully transferred onto an indium–tin oxide (ITO) electrode by the Langmuir–Blodgett technique. The effect of different metal cationic subphases on the π–A isotherm of Crown D was investigated. The photoelectric conversion properties of the chromoionophore LB monolayer films were studied. The results show that the photocurrent generation properties of the film strongly depend on the radius of the metal ions coordinated with the aza-15-crown-5 ring of the dye.

Multifunctional molecular materials combining photoelectric conversion and second-order optical nonlinearities in LB monolayer films

Abstract A series of multifunctional dye molecules with different relative positions of electron-accepting group, ( E )- N -methyl-4-[2-(4- N -methyl- N -hexadecylaminophenyl) ethenyl]-2-quinolinium iodide (MHQ-2), ( E )- N -methyl-4-[2-(4- N -methyl- N -hexadecylaminophenyl)ethenyl]-4-quinolinium iodide (MHQ-4) and ( E )- N -methyl-4-[2-(4- N -methyl- N -hexadecylaminophenyl)ethenyl]-6-quinolinium iodide (MHQ-6) were synthesized. These amphiphilic dye molecules were successfully transferred onto ITO electrode or quartz by Langmuir–Blodgett (LB) technique. The second-harmonic generation (SHG) and photoelectric conversion (PEC) properties of their monolayers were studied under identical conditions. The sequence of χ (2) and the photocurrent external quantum yield under the same conditions is MHQ-4>MHQ-2>MHQ-6, implying that the relative position of acceptor plays an important role in SHG and PEC properties.