UV-Vis-NIR spectra

Figure 7. UV-VIS-NIR spectra of perylene-, terrylene-, and quaterrylene tetracarboxdiimidees 42, 47, 49.

In addition to routinely used methods, such as elemental analysis, IR and UV-vis-NIR spectra, thermogravimetry-differential thermal analysis (TG-DTA), single-crystal X-ray diffraction, and gas adsorption, there are some important characterization methods for coordination polymers. 

Pristine SWCNTs and their fluorinated derivatives, F-SWCNTs, were reacted with organic peroxides to functionalize their sidewalls covalently by attachment of free radicals (Scheme 1.15). The tubes reactivity towards radical addition was compared with that of corresponding polyaromatic and conjugated polyene JT-systems [150, 151]. The characterization of the functionalized SWCNTs and F-SWCNTs was performed by Raman, FT-IR and UV/Vis/NIR spectroscopy and also by TGA/MS, TGA/FT-IR and with TEM measurements. The solution-phase UV/Vis/NIR spectra showed complete loss of the van Hove absorption band structure, typical of functionalized SWCNTs [150]. 

The UV-vis-NIR spectra of isolated EMF.v were recorded between 300 and 1100 nm in a toluene solution using a Varian Cary 500 Scan UV-Vis-NIR -spectrophotometer. 

The most characteristic spectroscopic feature of CT complexes is a new absorption band in their electronic (UV/vis/NIR) spectra that is not seen in the individual spectra of either the... 

The UV-vis-NIR spectra of isolated EMFs were recorded between 300 and... 

Figure 21 UV-vis-NIR spectra of different SWNTs. (a) Spectrum of SWNTs ropes produced by laser ablation in comparison with the colloidal graphite, (b) Symmetric transitions (DOS) between lowest subbands in the semiconducting (A, B) and the metallic (C) tubes, (c) HiPco samples in suspended sodium dodecyl sulfate (SDS) micelles. Individually suspended tubes shows 50 meV blue shit with respect to the rope material. (Reprinted with permission from Ref. 133. 2003 American Chemical Society)...

Figure 2.15 DR UV-Vis-NIR spectra of a 1.7wt% Ni<">/Si02 catalyst after different preparation steps (a) wet after centrifugation (b) filtered and dried at 293 K in air for 15 h (c) filtered and dried at 353 K in an oven for 15 h (d) calcined at 773 K in O2 and rehydrated for 1 year (e) unexchanged ammoniated Si02 dried in an oven at 353 K for 15h.

For the first reduction the IR shifts point to a porphyrin-centred electron transfer. This is supported by further spectroscopy on the anion radical complexes [(Por)Ru(CO)(L)]. The observed EPR lines are narrow, unstructured, with g values around 2. The UV-Vis-NIR spectra of the radical anions are characterised by redshifted Soret bands of reduced intensity, a weak structured band system around 600 nm and weak broad absorptions around 800 or 900 nm (see Figure 4.15). Further support comes from resonance Raman investigations on [(OEP)Ru(CO)(THF)] for which the observed Raman bands fit perfectly to those of the [(OEP)VO] radical anion. There is some evidence that if the spectroelectrochemistry is not carried out in very aprotic and unpolar solvents or traces of water are present, the radical anionic complexes are readily transformed. This has been investigated for the [(OEP)Ru(CO)(L)] system, where the use of solvents like MeOH or nitriles for the electrochemical reduction leads to altered species with unreduced porphyrin ligands (see Figure 4.15)." ... 

Figure 8. UV-vis-NIR spectra of a dichloromethane solution of complex 43 in a 0.5 mm pathlcngth OTTLE cell during oxidation with an applied potential of ca. 0.80 V vs. Ag-AgCl at 248 K (all three Ru centres oxidise at identical potentials of ca. 0.5 V) [115]...

Figure 2. Transmission and reflection UV- Vis-NIR spectra of the free-standing polyimide films.

Figure 6.6.1 Molecular structure of zinc porphyrinate cation radical dimers in solution and the UV/vis/NIR spectra of the zinc octaethylporphyrinate cation radical —) and its diamagnetic dimer (-------). (From Fuhrhop et al, 1972 Song et al, 1989.)...

Figure 7.2.10 UV-Vis/NIR spectra of flavins upon reduction, (a) Glucose oxidase pH 5.8 (...) and (—) pH 9.2 (From Massey, 1966.) (b) Riboflavin titration. (From Hemmerich, 1977.)...

Uv-vis-nir is another spectroscopic technique widely used for the characterization of conducting polymers. The existence of a spatially extended n-bonding system in conjugated polymers gives rise to electronic transitions in the uv-vis-nir region of the spectrum. In neutral (undoped) polymers, the dominant peak is usually associated with the n—n transition. The uv-vis-nir spectra of conjugated polymers can be treated as a qualitative measure of the overlap of their n orbitals. 

Protonation with aliphatic diesters of phosphoric acid in m-cresol results in the coexistence of both coil-like and extended coil-like conformations since the uv-vis-nir spectra the peak at around 800 nm is superimposed on the free carrier tail (Figure 4.12(c)). 

It should be stressed that the use of aromatic diesters of phosphoric acid always leads to the coil-like conformation with localized polarons, independently of the solvent iised, as evidenced by the uv-vis-nir spectra. 

Figure 4.20. Uv-vis-nir spectra of polyaniline recorded at different potentials. The arrows indicate the position of the excitation lines typically used in Raman spectroscopy with respect to the given spectrum of polyaniline measured in the same electrolyte E vs SCE, scanning rate 20 mV/s). (Reproduced from New J. Chem. 19, 365 (1995), S. Quillard, ei al. Copyright 1995, with kind permission from Gauthier-Villars Publishers.)...

Figure 8.2 The UV-vis-NIR spectra observed for PANI in its emeraldine base (EB) and salt (ES) forms (see the schematic structure). Above the spectra are presented the energy diagram for PANI-EB and PANI-ES. The UV-vis-NIR spectra were acquired using a Shimadzu UVPC-3101 scanning spectrophotometer in transmission mode with 1 mm quartz cell PANI-EB was dissolved in N-methyl-pyrrolidone and PANI-ES was dissolved in concentrated EICI...

IR-spectra were taken on a Bomem FT-spectrometer model M 100 under an argon atmosphere. UV-VIS-NIR-spectra were recorded on a Perkin-Elmer Lambda 9 UV-VIS-NIR-spectrophotometer under argon atmosphere. Gel permeation chromatographic ( GPC ) analyses were carried out at 25 °C employing a Perkin-Elmer Series 10 Liquid... 

Fig. 8.6 UV/vis/NIR spectra for hexametallic dendrimer 8.44 in Ru"-Ru", Ru "-Ru ", and Ru"-Ru " states. The latter state shows a NIR absorption at 1550 nm for the intervalence electron transfer. (Adapted from [100])...

FIGURE 8.24 UV-Vis-NIR spectra of PPy-DBSA solutions in (a) m-cresol, (b) DMSO, and (c) NMP with the polymer concentration of 0.01 g/dL. (From Song, K.T., Synthesis of electrically conducting soluble polypyrrole and its characterization. Ph.D. thesis, 2000. With permission.)... 

---