were studied in different solvents and media. The materials display strong emission solvatochromism that is reflected by a large red shift in their fluorescence emission maxima on increasing the solvent polarity. This change is accompanied by a successive decrease in fluorescence intensity. This behavior suggests a highly polar emitting state, which is characteristic of compounds that undergo an internal
A MALDI-TOF MS study of lanthanide(III)-cored poly(phenylenevinylene) dendrimers
作者:Joaquín C. García-Martínez、Carmen Atienza、Milagros de la Peña、Ana C. Rodrigo、Juan Tejeda、Julián Rodríguez-López
DOI:10.1002/jms.1534
日期:2009.5
An extensive study by matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) mass spectrometry (MS) of some first‐generation and second‐generation lanthanide(III)‐cored poly(phenylenevinylene) dendrimers is described. The complexes were obtained by self‐assembly of suitably functionalized carboxylate dendrons around the lanthanide ion (La3+, Er3+). Fourier transform infrared (FT‐IR) spectroscopy
Dendritic Triphenylmethylium
and Tetraphenylmethane Compounds
作者:Herbert Meier、Soungkyoo Kim、Annette Oehlhof
DOI:10.1055/s-0028-1083374
日期:——
from the low-field shifts of the ¹³C NMR signals. In contrast to the dark-blue dyes 3′a-c, the tris(stilbenyl)carbinols and tetrakis(stilbenyl)methane derivatives 3a-c and 7 exhibit long-wavelength absorption bands in the UV region. stilbene - charge delocalization - Wittig-Horner reaction - olefination - dendrimers -dyes