Spectra of tris

The absorption spectra of tris-polypyridyl Rhodium(III) complexes are characterised by several intense Ligand Centered (LC) absorption bands in the UV. Neither MC absorption bands, nor CT bands are observed in the visible region of the spectrum in contrast to their Ruthenium analogues. This makes tris(polypyridyl)Rh(III) complexes formed with bpy and phen practically colorless [1]. 

The fluorescence spectra of tris- and tetrakis-diketonato Eu and Eu complexes have been studied, and the amine sensitization of the fluorescence of (1 Ln = Eu, R = R = Ph) has been investigated. Trimethyldioxetan, on thermal decomposition in the presence of [Eu(tta)3(o-phen)], gives narrow band chemiluminescence. 

UV spectra of tri-,104,134,136,139,187 tetra-,81 134,136,139,187,188 and pentaalkylbenzo[6]thiophenes139 and of several of their monohalo derivatives81 have been recorded. Spectra have been given for substituted dimethoxy-189 and 5,6-methylenedioxybenzo[6]thio-phenes,189,190 and 6-substituted 2,3-dibromobenzo[6]thiophenes.77... 

Another process of interest in the mass spectra of tris(dimethyl-amino)phosphine derivatives is the elimination of a CH3NCH2 (azapro-pene) fragment. This occurs in ions containing first-row transition metals but no carbonyl groups, e.g. 

Raman and IR spectra of tri-, i-, and n-tetrasilane were measured, but no force constants were calculated. 

Jurgensen VW, Jalkanen K (2006) The VA, VCD, Raman and ROA spectra of tri-L-serine in aqueous solution. Phys Biol 3 S63-S69... 

Sato H, Taniguchi T, Monde K, Nishimura S-I, Yamagishi A (2006) Dramatic effects of d-electron configurations on vibrational circular dichroism spectra of tris(acetylacetonato) metal(III). Chem Lett 35 364-365... 

Sato H, Taniguchi K, Nakahashi A, Monde K, Yamagishi A (2007) Effects of central metal ions on vibrational circular dichroism spectra of tris-(a-diketonato)metal(in) complexes. Inorg Chem 46 6755-6766... 

The spectra of tri-AT-phenylborazoles (93) are characterized by fragments which are produced by the loss of one or two molecules of Ph—N=B—R from the molecular ion. Besides this, an ion of mass... 

Absorption Spectra of Tri- and Tetracyclic Aromatic Nitrogen Cations"... 

Whereas the B NMR spectrum of the pure N-trimethylborazine consists of a broad doublet with its center near 33 ppm, the spectra of mono-5-alkylsilylborazines show a singlet between 29 and 30.5 ppm beside the doublet. In the spectra of two fold-substituted borazines, the signal intensity of the singlet increases and the doublet signal shows less intensity. In the "B NMR spectra of tri- -alkylsilylborazines, only a singlet appears near 30 ppm. A borazine/silane ratio 1 3 gave exclusively completely substituted borazines according to B NMR spectroscopy. 

Hypercoordination of silicon in organosihcon compounds has often been associated with a considerable low frequency shift of Si signals. It is expected that the same effect will be observed for the Ge NMR spectra of hypercoordinated organogermanium compounds. The Ge NMR spectra of tris(o-substituted phenyl)germanes were examined and it was found that the Ge chemical shifts (summarized in Table 11) are not necessarily correlated with hypercoordination. 

The interactions of various cationic species with polyacids, such as polyCmethacrylic acid), PMA and polyCacrylic acid), PAA have been studied. In particular, the effect of polyacid conformation on the interaction is discussed in detail, and also the nature of the aggregation of PMA and cationic surfactants al)tyltrimethylammonium bromide, C TAB. The effect of the intermediate conformation states of PMA around pH 4-6 is noted, where the photophysical properties of cationic probes bound to PMA dramatically change, effects such as a large enhancement of the fluorescence intensity of Auramine 0, Au 0 at pH 4.5, a blue shift of the luminescence spectra of tris(2,2 -bipyridine)ruthenium(II) complex, Ru(bpy)3 at pH 5, and a great increase of the excimer yield of 1-pyrenebutyltrimethyl ammonium bromide, C PN at pH 6. 

The circular dichroism spectra in the region of the first absorption band of the tris-bidentate complex ions having six-membered chelate rings sure known to be particularly sensitive to experimental conditions. For example, the CD spectrum of A-lel -[Co(R,R-ptn) ]C1, in an aqueous solution shows two peaks A = -O.589, 522 nm A = - 0.104, 462.5 nm, whereas that of A-lel,-[Co(R,R-ptn) ](CIO,) in an aqueous solution gives a negative peak (A , = -O.587T at 518 nm (41). The solid state CD differ from the solution CD and the solution CD are sensitive to the temperature of measurement and are affected by the presence of oxo anions (42, 43, 44). Table V lists the lowest frequency CD spectra of tris-diamine cobalt(III) complexes in the CT region. 

Using all of the recorded CD data for tris-diamine cobalt-(III) complexes of known absolute configuration, an empirical rule relating the absolute configuration to CD spectra of tris-diamine cobalt(III) complexes in the charge-transfer region was estab-... 

Circular Dichroism Spectra of Tris(diamine)cobalt(III) Complexes... 

The mass spectra of tri-O-acetyl-D-glucal and other unsaturated sugars have been investigated.48 ... 

Palmer, R. A., Piper, T. S. (1966) 2,2 -bipyridine complexes. I. Polarized crystal spectra of tris (2,2 -bipyridine)copper(II),-nickel(II), -iron(Il) and ruthenium(Il). 

Figure 16 shows loading-dependent P single pulse NMR spectra of tri-ethylphosphine on silica-alumina, which reflect selective occupation of Bronsted... 

Figure 4. Emission spectra of tris-(2,2 -bipyridine)ruthenium(II) cation in [Zn(bipy)s ] SO 7H 0 crystal lattice in zero magnetic field at 1,65° and 4,2°K and in 75-kG field at 1.65°K, (a) Energy level diagram of [Ru-(bipy)sP and (b) magnetic fiela dependence of the emitting levels with magnetic field parallel to principal axis t, allowed transitions (15),...

Vibrational spectra of acetylacetonato complexes have been studied by many other workers. Only references are cited for the following Raman spectra of tris(acac) complexes, infrared spectra of acac complexes of rare-earth metals, relationships between CH and CH3 stretching frequencies and C—H spin-spin coupling constants, and relationships between p(C—O), p(C C), and C NMR shifts of CO groups. ... 

The temperature-dependent n.m.r. spectra of tris-(a-isopropyltropo-lonato)- and tris-(a-isopropyltropolonato)-vanadium(iii) have shown that they... 

The elimination of sample luminescence using a diode laser was demonstrated by measuring SER spectra of tris(2,2 -bipyridine)ruthenium(II), [RB,], in bulk solution. RBj is a highly luminescent compound that has lecdved considerable interest because of its unique excited state properties (24-26). However, because of its intense visible luminescence, it is difficult to obtain luminescence-free Raman spectra even with SER enhancement. Further, visible-wavelength Raman spectra of this compound are usually complicated by resonance Raman contributions to the spectrum. 

Figure 7. Luminescence spectra of tris (divinyldibenzoylmethanato) europium(IIl). (Reprintedfrom reference 20, with permission from Elsevier.)...

Fig. 3.13 DSC spectra of tri-promoted Fei 0 and Fea04 based catalysts (Weight of sample 27.1 mg, heating rate 10 K-min , N2 flow of 50ml-min )...

Chakraborty S, Yamada K, Ishiuchi S, Fujii M (2012) Gas phase IR spectra of tri-peptide Z-Pro-Leu-Gly effect of C-terminal amide capping on secondary structure. Chem Phys Lett 531 41... 

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