Resonance Raman spectroscopy porphyrins

Lesieur P, Vandevyver M, Ruaudel-Teixier A and Barraud A Orientational studies of Langmuir-Blodgett films of porphyrins with polarized resonant Raman spectroscopy Thin Soiid Fiims 159 315-22... 

The functionalization of zinc porphyrin complexes has been studied with respect to the variation in properties. The structure and photophysics of octafluorotetraphenylporphyrin zinc complexes were studied.762 Octabromoporphyrin zinc complexes have been synthesized and the effects on the 11 NMR and redox potential of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraarylporphyrin were observed.763 The chiral nonplanar porphyrin zinc 3,7,8,12,13,17,18-heptabromo-2-(2-methoxyphenyl)-5,10,15,20-tetraphenylporphyrin was synthesized and characterized.764 X-ray structures for cation radical zinc 5,10,15,20-tetra(2,6-dichlorophenyl)porphyrin and the iodinated product that results from reaction with iodine and silver(I) have been reported.765 Molecular mechanics calculations, X-ray structures, and resonance Raman spectroscopy compared the distortion due to zinc and other metal incorporation into meso dialkyl-substituted porphyrins. Zinc disfavors ruffling over doming with the total amount of nonplanar distortion reduced relative to smaller metals.766 Resonance Raman spectroscopy has also been used to study the lowest-energy triplet state of zinc tetraphenylporphyrin.767... 

Nickel porphyrins—Continued resonance Raman spectroscopy... 

Photoinduced ligation changes, nickel porphyrins, resonance Raman spectroscopy transient, 266-277 Photoinduced reversible conversion of centers, porphyrins with nonsymmetrical substitution, 83-84,85f Photooxidation,... 

The bis-hydroxylamine adduct [Fe (tpp)(NH20H)2] is stable at low temperatures, but decomposes to [Fe(tpp)(NO)] at room temperature. [Fe(porphyrin)(NO)] complexes can undergo one-and two-electron reduction the nature of the one-electron reduction product has been established by visible and resonance Raman spectroscopy. Reduction of [Fe(porphyrin)(NO)] complexes in the presence of phenols provides model systems for nitrite reductase conversion of coordinated nitrosyl to ammonia (assimilatory nitrite reduction), while further relevant information is available from the chemistry of [Fe (porphyrin)(N03)]. Iron porphyrin complexes with up to eight nitro substituents have been prepared and shown to catalyze oxidation of hydrocarbons by hydrogen peroxide and the hydroxylation of alkoxybenzenes. ... 

The photophysical properties of [Ru(TBP)(CO)(EtOH)], [Ru(TBP)(pyz)2], [Ru(TBP)(pyz)] (Fl2TBP = 5,10,15,20-tetra(3,5-tert-butyl-4-hydroxyphenyl)porphyrin) have been investigated by steady-state and time-resolved absorption and emission spectroscopies. The complexes are weakly luminescent, and the origins of this behavior is discussed.Transient Raman spectroscopic data have been reported for [Ru(TPP)(py)2], [Ru(TPP)(CO)(py), and [Ru(TPP)(pip)2] (pip = piperidine),and nanosecond time-resolved resonance Raman spectroscopy has been used to examine the CT excited states of [Ru(0EP)(py)2] and [Ru(TPP)(py)2]. " ... 

For example, see T. G. Spiro, The resonance Raman spectroscopy of metalloporphyrins and heme proteins, in Iron Porphyrins (A. B. P. Lever and H. B. Gray, eds.), Part II. Addison-Wesley, Reading, MA, 1983. 

Model heme complexes containing the ferryl unit and a nonoxidized porphyrin ring have been prepared and investigated by H NMR spectroscopy at low temperatures by Balch and La Mar and coworkers and by resonance Raman spectroscopy by Nakamoto and coworkers. The ferryl species have been produced by several means, including... 

R. S. Czemuszewicz, E. M. Maes, and J. G. Rankin, Resonance Raman Spectroscopy of Petroporphyrins, in eds. K. M. Kadish, K. M. Smith and R. Guilard, The Porphyrin Handbook , Academic Press, 2000, Vol. 7. Metalloporphyrins have provided a particularly rich oppormnity for resonance Raman smdies and this book chapter discusses various aspects of pioneering work in the area of geological metalloporphyrins. 

Metal-ligand modes were identified by resonance Raman spectroscopy, and assigned after a normal coordinate analysis, for Mn2(0)(0Ac)2(bipy)2 (H20)2.24° Resonance Raman spectra of MnN(P), where P = a range of porphyrins, included vMn=N near 1050 cm-1.241 The IR spectra of Min(P)Cl, Mn(P), where M111 = Mn, Fe Mn = Co, Ni, Cu, Zn, P = meso-tetra-(4-myristyloxy-phenyl)porphyrin, included vMnN (coupled with a porphyrin deformation mode) at 250 cm 1, and vMninCl 320 cm 1.242... 

The photophysics of a three-dimensional zinc(II) porphyrin box, (PyZZ)4, was followed by resonance Raman spectroscopy - giving evidence for perturbation of the ring planarity.256 DFT calculations have been reported for the vibrational wavenumbers of Zn(2-N02 TPP).257 The IR spectra of two isomers (50, vCN 1640 cm-1) and (51, vCN 1610, 1587 cm-1) were both seen in solution (in C2D2C14)258... 

In a novel experiment, Koyama et al. (57) obtained a spectrum of carotenoid BLM by resonance Raman spectroscopy—a major advance in BLM spectroscopy. For efficient charge transfer, the orientation of chlorophyll molecules at the membrane-solution interface is important. Brasseur et al. (58) developed a procedure for conformation analysis to define the position of chlorophyll in BLM. They found that the porphyrin ring is orientated at an angle of 45 5° to the plane of the BLM, which is in excellent agreement with the value reported previously (44). 

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