New quadrupolar fluorophores that exhibit enhanced two-photon excited fluorescence were designed according to a molecular engineering approach based on push-push and pull-pull elongated molecules built from a rigid conjugated core (either dihydrophenanthrene or dithienothiophene).
[EN] DYNAMERS: POLYMERIC MATERIALS EXHIBITING REVERSIBLE FORMATION AND COMPONENT EXCHANGE<br/>[FR] DYNAMERES: MATERIAUX POLYMERIQUES A FORMATION REVERSIBLE ET A ECHANGE DE COMPOSANTS
申请人:LEHN JEAN-MARIE
公开号:WO2004003044A2
公开(公告)日:2004-01-08
Alternating co-polymers involving the polycondensation of dihydrazides or diamines with dialdehydes reversibly exchange either one or both of their fundamental repeating monomer units in the presence of different monomer units. Furthermore, upon exchange of one of the repeating monomer units, the original monomer unit displaced can be re-introduced into the polymer, or the remaining unexchanged original monomer unit may also be interchanged. The polymers subjected to monomer exchange/interchange exhibit vastly different physical properties than those of the original unexchanged polymer. These dynamic, reversible polymers are therefore able to incorporate, decorporate or reshuffle their constituting monomers, in particular, with respect to environmental physical or chemical factors (heat, light, chemical entities, etc.). They thus have combinatorial features and represent adaptive materials.
Electron transfer in bis-porphyrin donor-acceptor compounds with polyphenylene spacers shows a weak distance dependence
作者:Anna Helms、David Heiler、George McLendon
DOI:10.1021/ja00041a047
日期:1992.7
containing one, two, or three phenyl bridges. Complete synthetic details are provided. For studies of photochemicalelectrontransfer, mixed metals were incorporated, with zinc in one porphyrin macrocycle and Fe III (bis-imidazole) in the other macrocycle. When photoexcited, an electron is transferred from Zn to Fe III
已经合成了一系列亚苯基桥连的双卟啉加合物,包含一个、两个或三个苯桥。提供了完整的合成细节。为了研究光化学电子转移,加入了混合金属,锌在一个卟啉大环中,而 Fe III(双咪唑)在另一个大环中。当光激发时,一个电子从 Zn 转移到 Fe III
Nanoscale Push-Push Dihydrophenanthrene Derivatives as Novel Fluorophores for Two-Photon-Excited Fluorescence
Outperforming fluorescein by far, elongated fluorophores (e.g. 1) give rise to large two-photon absorption cross-sections σ2 in the visible-red or NIR region and high quantum fluorescence yields Φ (see figure; GM = 10-50 cm4 s photon-1 ). This opens interesting prospects in the field of two-photon microscopy imaging of cell membranes.