Functionalized core–shell Ag@TiO<sub>2</sub> nanoparticles for enhanced Raman spectroscopy: a sensitive detection method for Cu(<scp>ii</scp>) ions
作者:Florian Forato、Somayeh Talebzadeh、Nicolas Rousseau、Jean-Yves Mevellec、Bruno Bujoli、D. Andrew Knight、Clémence Queffélec、Bernard Humbert
DOI:10.1039/c8cp07504b
日期:——
This paper demonstrates the use of surface plasmon resonance of core–shell Ag@TiO2 particles in SHINERS experiments. A copper(II) complex grafted onto Ag@TiO2 surface was probed by Raman spectroscopy using resonanceexcitationprofiles vs. excitation wavelengths (514, 633 and 785 nm) to tune the Raman signals. Enhancement factors of the SHINERS assembly have been estimated and compared to the SERS
本文证明了SHINERS实验中核壳Ag @ TiO 2颗粒的表面等离振子共振的应用。用共振激发曲线对激发波长(514、633和785 nm)进行拉曼光谱探测,将接枝到Ag @ TiO 2表面的铜(II)络合物调谐到拉曼信号。已估算出SHINERS组件的增强因子,并将其与未修饰的银NPs胶体分散体的SERS效果进行了比较。最后,将铜(II)络合物接枝到Ag @ TiO 2上与接枝到Ag @ SiO 2壳上相比是有利的。
Phosphono derivatives of purine with antiviral activity
申请人:Beecham Group p.l.c.
公开号:EP0404296A1
公开(公告)日:1990-12-27
A compound of formula (I), or a pharmaceutically acceptable salt thereof:
wherein
R₁ is hydroxy or amino;
R₂ is hydrogen or amino;
R₃ is hydrogen, hydroxymethyl or acyloxymethyl;
R₄ is hydrogen or (when R₃=H and Z is a bond or CH₂) hydroxy, acyloxy, hydroxymethyl or acyloxymethyl;
Z is a bond, or a group CHR₈ wherein R₈ is hydrogen, or (when R₃=R₄=H), R₈ is hydroxy, acyloxy, hydroxymethyl or acyloxymethyl;
R₅ is a group of formula:
wherein
R₆ and R₇ are independently selected from hydrogen, C₁₋₆ alkyl and optionally substituted phenyl.