A class of fluorescent rare earth chelates and the ligands upon which they are based whose molecular structure incorporates a plurality of substituted arylpyridine diacid units attached to a central template structure is disclosed. These ligands function as efficient energy transfer groups in fluorescent tagging reagents and tracers. ##STR1##
Synthesis and properties of poly(p-phenylene vinylene) derivatives with hyperbranched structure and containing a nitro substituent
作者:Ruyu Li、Yanjiao Mo、Rong Shi、Peng Li、Chengyu Li、Zhenjiang Wang、Xun Wang、Shengbiao Li
DOI:10.1007/s00706-013-1051-2
日期:2014.1
vinylene) (PPV) derivatives (P1-P3 and P4-P6) with hyperbranched structure and containing a nitro substituent were synthesized via a Gilch reaction in different monomer ratios. The properties of the polymers were investigated by using UV-Vis absorption, fluorescence spectroscopy, cyclic voltammetry, and thermogravimetric analysis. The result shows that the bandgaps of the PPV derivatives with a nitro
Photocleavable Anionic Glues for Light-Responsive Nanoparticle Aggregates
作者:Jinhua Wang、Tzuf Shay Peled、Rafal Klajn
DOI:10.1021/jacs.2c11973
日期:——
assembled state, resulting in light-triggereddisassembly of NP aggregates. To demonstrate the proof-of-concept, we work with an organic PAG incorporating the UV-cleavable o-nitrobenzyl moiety and an inorganic PAG, the photosensitive trioxalatocobaltate(III) complex, which absorbs light across the entire visible spectrum. Both PAGs were used to prepare either amorphous NP assemblies or regular superlattices
Synthesis, molecular structure, and properties of in-phosphaphanes with substituted basal aromatic rings
作者:Anthony P. West、Natalie Smyth、Christina M. Kraml、Douglas M. Ho、Robert A. Pascal
DOI:10.1021/jo00065a009
日期:1993.6
A series of nitro-substituted phosphine-containing cyclophanes (2-4) was prepared by base-promoted condensation of various nitrated derivatives of 1,3,5-tris(bromomethyl)benzene with tris(2-mercaptophenyl)phosphine under conditions of high dilution. The mononitro cyclophane 2 was reduced with TiCl3 in THF-EtOH to give the corresponding amino derivative 5. The C-13 NMR spectra of these compounds exhibit ''through-space'' spin-spin coupling between the phosphorus and the substituted basal aromatic ring, and in their P-31 NMR spectra the phosphorus resonances are anomalously far downfield. The nitro-substituted phanes are colored, probably due to charge-transfer absorptions between the phosphine and the nitroarene base. The X-ray crystal structures of cyclophanes 4 and 5 reveal a pronounced inward pyramidalization of the phosphines such that the phosphorus atoms are 2.98 and 2.92 angstrom, respectively, from the centers of the basal rings. These cyclophanes are rigid, molecular propellers, and compound 2 was chromatographically resolved on a chiral HPLC column. The circular dichroism spectra of the pure enantiomers showed a very high molecular ellipticity at 332 nm of 120 000 deg.cm2.dmol-1.