4-Amino-N-methylphthalimide

Response characterization of a fiber optic sensor array with dye-coated planar waveguide for detection of volatile organic compounds.[Pubmed:24988381]

Sensors (Basel). 2014 Jul 1;14(7):11659-71.

We have developed a multi-array side-polished optical-fiber gas sensor for the detection of volatile organic compound (VOC) gases. The side-polished optical-fiber coupled with a polymer planar waveguide (PWG) provides high sensitivity to alterations in refractive index. The PWG was fabricated by coating a solvatochromic dye with poly(vinylpyrrolidone). To confirm the effectiveness of the sensor, five different sensing membranes were fabricated by coating the side-polished optical-fiber using the solvatochromic dyes Reinhardt's dye, Nile red, 4-aminophthalimide, 4-Amino-N-methylphthalimide, and 4-(dimethylamino)cinnamaldehyde, which have different polarities that cause changes in the effective refractive index of the sensing membrane owing to evanescent field coupling. The fabricated gas detection system was tested with five types of VOC gases, namely acetic acid, benzene, dimethylamine, ethanol, and toluene at concentrations of 1, 2,...,10 ppb. Second-regression and principal component analyses showed that the response properties of the proposed VOC gas sensor were linearly shifted bathochromically, and each gas showed different response characteristics.

Ultrashort-lived excited states of aminophthalimides in fluid solution.[Pubmed:12803081]

Photochem Photobiol Sci. 2003 May;2(5):576-84.

The Sn-->S0 ultraviolet fluorescence spectra (270-380 nm) of 4-aminophthalimide (4AP) and its N-methyl derivative 4-Amino-N-methylphthalimide (4ANMP) are reported, following the absorption of two laser pulses. In polar but non-hydrogen-bonding solvents, both molecules exhibit a principal emission maximum near 290 nm, whereas solutions in hydrogen-bonding solvents display two prominent emission bands, near 300 and 350 nm. The relative intensities of these bands depend on solvent type and, in a pump-probe experiment, on the wavelengths and temporal spacing of two ultrashort pulses. Experiments covering the range approximately 0.1-100 ps showed evidence for at least two distinct ultrashort relaxation processes, the rates of which depend on solvent. Fluorescence upconversion experiments at < 0.2 ps resolution have shown that the longer-duration process correlates with the fluorescence Stokes shift, and provide evidence that the solvent-dependent shift of the S1-->S0 fluorescence spectrum is reflected in the fluorescence quantum efficiency of a nearby electronic state.