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• W2108299300 abstract "The effect of solvents on the absorption and emission spectra of 1,4-bis(5-phenyl-2-oxazolyl)benzene (POPOP) laser dye has been studied in various solvents at 298&#x2009;K. A bathochromic shift was observed in absorption and fluorescence spectra upon increase of solvent polarity, which indicates that this transition is <i>&#x3c0;</i>-<svg style=vertical-align:-0.16302pt;width:15.975px; id=M1 height=11.7375 version=1.1 viewBox=0 0 15.975 11.7375 width=15.975 xmlns=http://www.w3.org/2000/svg> <g transform=matrix(1.25,0,0,-1.25,0,11.7375)> <g transform=translate(72,-62.61)> <text transform=matrix(1,0,0,-1,-71.95,62.83)> <tspan style=font-size: 12.50px; x=0 y=0>𝜋</tspan> </text> <text transform=matrix(1,0,0,-1,-64.35,67.83)> <tspan style=font-size: 8.75px; x=0 y=0>∗</tspan> </text> </g> </g> </svg>. The ground and excited state dipole moments were calculated as 2.23 and 6.34 Debye, respectively. The dye solution in MeOH, <i >n</i>-heptane, and methyl isobutyl ketone gives laser emission in the blue region upon excitation by a 337.1&#x2009;nm nitrogen pulse; the gain coefficient and emission cross section as well as normalized photostability have been determined. Excitation energy transfer from POPOP to rhodamine B and fluorescine was studied to improve the laser emission from these dyes. Such an energy transfer dye laser system (ETDL) obeys a long range columbic energy transfer mechanism with a critical transfer distance, <i >R</i>₀, of 25 and 33&#x2009;&#xc5; and <i >k_q</i> equal to <svg style=vertical-align:-0.3135pt;width:71.612503px; id=M2 height=14.375 version=1.1 viewBox=0 0 71.612503 14.375 width=71.612503 xmlns=http://www.w3.org/2000/svg> <g transform=matrix(1.25,0,0,-1.25,0,14.375)> <g transform=translate(72,-60.5)> <text transform=matrix(1,0,0,-1,-71.95,60.86)> <tspan style=font-size: 12.50px; x=0 y=0>1</tspan> <tspan style=font-size: 12.50px; x=6.2515001 y=0>0</tspan> <tspan style=font-size: 12.50px; x=12.503 y=0>.</tspan> <tspan style=font-size: 12.50px; x=15.62875 y=0>4</tspan> <tspan style=font-size: 12.50px; x=24.655916 y=0>×</tspan> <tspan style=font-size: 12.50px; x=35.433502 y=0>1</tspan> <tspan style=font-size: 12.50px; x=41.685001 y=0>0</tspan> </text> <text transform=matrix(1,0,0,-1,-24.01,66.03)> <tspan style=font-size: 8.75px; x=0 y=0>1</tspan> <tspan style=font-size: 8.75px; x=4.3759999 y=0>2</tspan> </text> </g> </g> </svg> and <svg style=vertical-align:-0.3135pt;width:71.612503px; id=M3 height=14.375 version=1.1 viewBox=0 0 71.612503 14.375 width=71.612503 xmlns=http://www.w3.org/2000/svg> <g transform=matrix(1.25,0,0,-1.25,0,14.375)> <g transform=translate(72,-60.5)> <text transform=matrix(1,0,0,-1,-71.95,60.86)> <tspan style=font-size: 12.50px; x=0 y=0>2</tspan> <tspan style=font-size: 12.50px; x=6.2515001 y=0>6</tspan> <tspan style=font-size: 12.50px; x=12.503 y=0>.</tspan> <tspan style=font-size: 12.50px; x=15.62875 y=0>2</tspan> <tspan style=font-size: 12.50px; x=24.655916 y=0>×</tspan> <tspan style=font-size: 12.50px; x=35.433502 y=0>1</tspan> <tspan style=font-size: 12.50px; x=41.685001 y=0>0</tspan> </text> <text transform=matrix(1,0,0,-1,-24.01,66.03)> <tspan style=font-size: 8.75px; x=0 y=0>1</tspan> <tspan style=font-size: 8.75px; x=4.3759999 y=0>2</tspan> </text> </g> </g> </svg> <svg style=vertical-align:-0.12538pt;width:54.299999px; id=M4 height=13.925 version=1.1 viewBox=0 0 54.299999 13.925 width=54.299999 xmlns=http://www.w3.org/2000/svg> <g transform=matrix(1.25,0,0,-1.25,0,13.925)> <g transform=translate(72,-60.86)> <text transform=matrix(1,0,0,-1,-69.87,61.03)> <tspan style=font-size: 12.50px; x=0 y=0>M</tspan> </text> <text transform=matrix(1,0,0,-1,-58.75,66.03)> <tspan style=font-size: 8.75px; x=0 y=0>−</tspan> <tspan style=font-size: 8.75px; x=5.99512 y=0>1</tspan> </text> <text transform=matrix(1,0,0,-1,-45.8,61.03)> <tspan style=font-size: 12.50px; x=0 y=0>s</tspan> </text> <text transform=matrix(1,0,0,-1,-39.47,66.03)> <tspan style=font-size: 8.75px; x=0 y=0>−</tspan> <tspan style=font-size: 8.75px; x=5.99512 y=0>1</tspan> </text> </g> </g> </svg> for the POPOP/RB and POPOP/fluorescine pair, respectively. The POPOP dye is highly photostable in polar protic and polar aprotic solvents, while it displays photodecomposition in chloromethane solvent via formation of a contact ion pair. The photochemical quantum yield and rate of photodecomposition depend on the electron affinity of solvent." @default.
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• W2108299300 date "2012-01-01" @default.
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• W2108299300 title "Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye" @default.
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• W2108299300 doi "https://doi.org/10.1155/2012/458126" @default.
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