Electronic spectra inorganic compounds

A photoprocess rather common with inorganic compounds is the formation of solvated electrons, e [ in organic solvents and eat in aqueous solutions.43,44 The photoprocess is most commonly observed with anions whose absorption spectrum exhibits a characteristic charge transfer to solvent, CTTS, band in the ultraviolet. It is the typical photoprocess of the halide anions shown in Equations 6.89 and 6.90 where X = Cl, Br, and I-. 

Literally thousands of papers have been written describing the photochemical and photophysical properties of [Ru(bpy)3] + over the past several decades, making it one of the most widely studied compounds in the history of inorganic chemistry. The compound exhibits a rich electronic spectrum, with several high-energy n n ligand-centered transitions in the near-UV, weak LF absorptions around 400 nm, and a series of intense MLCT bands around 450 nm. Excitation of the MLCT bands leads... 

It is often convenient, as it is now, to divide the fundamental ways in which color is created in chemical substances into two classes corresponding to the traditional division into organic and inorganic compounds. However, it wiU become apparent later in the discussion that this division is not a strict one since some compounds in both classifications exhibit color by the same type of mechanism. In aU cases, electronic transitions between energy level differences in the visible region of the spectrum must take place. 

A vital point to note is that the mass spectrum of the product ions in much simpler than would be obtained using electron impact ionization of the air or breath sample, because chemical ionization is used. However, only a limited number of precursor ions can be used, which must not react at a significant rate with the major components of air or breath, N2, O2, CO2, H2O and Ar, but obviously must react efficiently with the trace gases in the sample. In this respect H30% NO+ and O are the prime candidates, and SIFT studies of a great number of the reactions of these three ions with a wide variety of organic and inorganic compounds have shown that H30 and NO+ are of widest application, with being useful for fewer... 

With metal clusters it is even harder than in other fields of inorganic chemistry to substantiate theoretical results by energy measurements. Only two such measurements have come to the attention of the author — the photoelectron spectrum of [CpFe(C0)]4 370) andbond energy determinations in 03(00)9CX-compounds 187). However, a considerable number of papers deal with metal-metal bonding in, and the symmetry properties of, clusters as related to their stoichiometry and their electron count. These studies have confirmed the wide apphcability of the simple 18-electron rule in predicting metal-metal bonds and structures, but they have also led to an understanding of the limits of this rule for clusters with more than four metal atoms. 

Multinuclear NMR- ( C, Pt, T1), 1R-, Raman-spectroscopy. Electron Spectroscopy for Chemical Analysis (ESCA), X-ray, and Extended X-ray Absorption Fine Structure (EXAFS) studies confirm direct, short (2.60-2.64 A) Pt-Tl bonds. Figure 1. shows a typical ° T1 NMR spectrum of [(N C)5Pt-Tl( CN)] together with the structure determined by EXAFS. The spin-spin coupling pattern is consistent with 4 -h 1 - -1 equivalentligands (I = 1/2), respectively and one Pt nucleus (natural abundance 33.8%, 1=1 /2). The spectrum has been selected to illustrate the usefulness of T1 NMR spectroscopy in studies of the inorganic chemistry of thallium. The compounds are diamagnetic, and... 

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