Articles

Surface Enhanced Raman Scattering of trans-3-Hydroxycinnamic acid adsorbed on Silver Nanoparticles Abstract SERS of trans-3-hydroxycinnamic acid adsorbed on silver colloids have been analyzed in order to detect resonant charge transfer processes similar to a resonance Raman mechanism, involving the photoinduced transfer of an electron from the metal to the adsorbate (SERS-CT). Theoretical SERS-CT intensities for…

Effect of hydrogen bonding in the vibrational spectra of trans-cinnamic acid. Abstract A computationally-assisted methodology to assign the vibrational spectra of molecular materials (PiMM) has been successfully applied to the Raman and infrared (IR) spectra of trans-cinnamic acid (t-CIA) in the solid state. The effects of molecular association through O-H center dot center dot center…

MCM-41 derivatised with pyridyl groups and its use as a support for luminescent europium(III) complexes. Abstract An organic-inorganic hybrid ligand silica was prepared by reaction of the ordered mesoporous silica MCM-41 with 3-triethoxysilylpropyl 4-pyridylacetamide. Elemental analysis indicated that a pyridyl group loading of 0.93 mmolg(-1) was achieved. The derivatised material was further characterised by powder…

Synthesis, characterisation and luminescence properties of MCM-41 impregnated with an Eu3+ β-diketonate complex Abstract A luminescent material has been prepared by formation of the Eu3+ β-diketonate complex Eu(NTA)3L″ {NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetonate; L″ = ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate} within the channels of MCM-41-type ordered mesoporous silica. Using simple wet impregnation methods, the ligand L″ was first encapsulated followed by…

Pseudopolymorphic transitions of niclosamide monitored by Raman spectroscopy. Abstract “Niclosamide suffers pseudopolymorphic transformations when exposed to different ambient conditions, which can lead to changes in its bioavailability. In this study, the kinetics of the pseudopolymorphic transitions of niclosamide crystals are characterized. FT-Raman spectroscopy is used to quantify the anhydrate and hydrate forms of niclosamide crystals,…