Noh, Su Bum Kim, Ran Hee Kim, Won Jin Kim, Sehoon Lee, Kwang-Sup Cho, Nam Sung Shim, Hong-Ku Pudavar, Haridas E. Prasad, Paras N. 2024-01-20T18:34:31Z 2024-01-20T18:34:31Z 2021-09-01 2010-09 0959-9428 https://pubs.kist.re.kr/handle/201004/131161 This paper reports synthesis and semiempirical modeling of 1,4-bis(cyanostyryl) benzene (CSB)-based quadrupolar isomeric molecules (alpha-and beta-CSB-TPs), designed to produce enhancement in fluorescence quantum yield and two-photon absorption cross-sections for the nanoaggregate form. Fluorescence yield together with high two-photon optical properties of the isomers have been fine-tuned by moving the cyano group from alpha to beta position, which results in longer absorption-fluorescence wavelengths, and higher one-and two-photon absorptivities for the beta-CSB-TP. In nonpolar toluene solution, both isomers exhibit strong one-and two-photon induced fluorescence. Both isomers followed a trend of strong solvatochromisms which was gradually on increasing solvent polarity. Aqueous dispersions of nanoparticles with diameters of ca. 150 nm have been prepared by aggregation of each isomer. The quenched fluorescence in polar media was greatly intensified followed by a 21 fold increase in TPA cross-sections. This helped achieve intense up-converted fluorescence by two-photon absorption of excited beta-CSB-TP organic nanoparticles. Coaggregation-enhanced tunable fluorescence has also been demonstrated as a possible application of the isomeric alpha-and beta-CSB-TP mixture. English ROYAL SOC CHEMISTRY OPTICAL-DATA STORAGE EXCITATION CROSS-SECTIONS POWER-LIMITING PROPERTIES POLYMERIC MATERIAL FLUOROPHORES CHROMOPHORES MOLECULES EMISSION HECK STEREOLITHOGRAPHY Aggregation-enhanced two-photon absorption and up-converted fluorescence of quadrupolar 1,4-bis(cyanostyryl) benzene derivatives showing solvatochromic fluorescence Article 10.1039/c0jm00716a 1 JOURNAL OF MATERIALS CHEMISTRY, v.20, no.35, pp.7422 - 7429 JOURNAL OF MATERIALS CHEMISTRY 20 35 7422 7429 scie scopus 000281223200019 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article OPTICAL-DATA STORAGE EXCITATION CROSS-SECTIONS POWER-LIMITING PROPERTIES POLYMERIC MATERIAL FLUOROPHORES CHROMOPHORES MOLECULES EMISSION HECK STEREOLITHOGRAPHY