Step-Scan FT-IR Time-Resolved Spectroscopy in the Solid State
نویسندگان
چکیده
The use of KBr pellets as an interference-free matrix for performing time-resolved infrared (TR-IR) measurements on samples in their crystalline state is described and demonstrated. Step-scan Fourier transform infrared time-resolved spectroscopy (S2FT-IR TRS) is used to measure the infrared (IR) absorption difference ( D A, excited state minus ground state) spectra of the long-lived chargetransfer excited states of polypyridine Ru(II) and Pt(II) complexes pressed into KBr pellets. A comparison of the difference spectra measured for the metal-to-ligand charge-transfer (MLCT) state of the Ru(II) complex in a KBr pellet vs. acetonitrile (ACN) solution is used to validate the technique. The Pt(II) complex could not be analyzed in solution because of its extremely poor solubility. Thus, these results illustrate one of the signi cant advantages of performing TR-IR measurements on solid KBr sample pellets.
منابع مشابه
Modern Step-scan Interferometry
www.spec t roscopyon l i ne . com T he concept of step-scan mid-infrared inter ferometr y dates back to the 1960s when the first optoelectronically controlled step-scan interferometer was reported (1). In contrast to the linear change of the optical path difference (retardation) in a conventional continuous-scan interferometer, the retardation changes stepwise in a step -scan Fourier transform–...
متن کاملTime-resolved flow-flash FT-IR difference spectroscopy: the kinetics of CO photodissociation from myoglobin revisited
Fourier-transform infrared (FT-IR) difference spectroscopy has been proven to be a significant tool in biospectroscopy. In particular, the step-scan technique monitors structural and electronic changes at time resolutions down to a few nanoseconds retaining the multiplex advantage of FT-IR. For the elucidation of the functional mechanisms of proteins, this technique is currently limited to repe...
متن کاملTime-resolved spectral characterization of ring cavity surface emitting and ridge-type distributed feedback quantum cascade lasers by step-scan FT-IR spectroscopy.
We present the time-resolved comparison of pulsed 2nd order ring cavity surface emitting (RCSE) quantum cascade lasers (QCLs) and pulsed 1st order ridge-type distributed feedback (DFB) QCLs using a step-scan Fourier transform infrared (FT-IR) spectrometer. Laser devices were part of QCL arrays and fabricated from the same laser material. Required grating periods were adjusted to account for the...
متن کاملCopper Oxide Nanoparticles Prepared by Solid State Thermal Decomposition: Synthesis and Characterization
In this paper, we have focused on the preparation and characterization of copper oxide nanoparticles by solid state thermal decomposition of copper(I) iodide in the presence of thiosemicarbazone ligands without the need for a catalyst, employing toxic solvent, template or surfactant and complicated equipment, which makes it efficient, one-step, simple and environment-friendly. CuO nanoparticles...
متن کاملNickel Oxide (NiO) nanoparticles prepared by solid-state thermal decomposition of Nickel (II) schiff base precursor
In this paper, plate-like NiO nanoparticles were prepared by one-pot solid-state thermal decomposition of nickel (II) Schiff base complex as new precursor. First, the nickel (II) Schiff base precursor was prepared by solid-state grinding using nickel (II) nitrate hexahydrate, Ni(NO3)2∙6H2O, and the Schiff base ligand N,N′-bis-(salicylidene) benzene-1,4-diamine) for 30 min without using any solv...
متن کامل