scholarly journals Transient Resonance Raman Studies of Ru(II) Complexes in DNA and in Homogeneous Media

1999 ◽  
Vol 19 (1-4) ◽  
pp. 237-243
Author(s):  
Colin G. Coates ◽  
John J. McGarvey ◽  
Steven E. J. Bell ◽  
Luc Jacquet ◽  
John M. Kelly ◽  
...  
Keyword(s):  
Excited States ◽  
Resonance Raman ◽  
Homogeneous Solution ◽  
Vibrational Modes ◽  
Enhancement Pattern ◽  
Dna Complexes ◽  
Bridging Ligand ◽  
Transient Resonance ◽  
Homogeneous Media ◽  
Mlct State

Transient resonance Raman (TR2) spectroscopy has been used to investigate the metalligand charge-transfer (MLCT) excited states of Ru(II) polypyridyl complexes inDNAand in homogeneous solution. In DNA, complexes of the type [Ru(L)2(L′)]2+ were studied, where L=2, 2’-bipyridyl (bpy), 1,4, 5, 8-tetraazaphenanthrene (tap), and L′ dipyrido [3,2:a-2′ ,3′:c]-phenazine (dppz) or 1,4,5,8,9,12-hexaazatriphenylene (HAT). For [Ru(bpy)2(HAT)]2+, the enhancement pattern of vibrational modes in the TR2 spectra attributable to reduced HAT⋅− in the triplet MLCT state suggest perturbations to the intraligand transition of HAT⋅− in the presence of DNA. Transient RR spectra for [Ru(tap)2(dppz)]2+ are indicative of formation of the species RunII(tap⋅−)(tap)(dppz) by electron transfer from DNA to the triplet MLCT state of the complex.TR2 spectra for complexes of the type, [(Ru(bpy)2)n(L)]2+ , n=1, 2 where L=a triazole bridging ligand, illustrate the use of the technique as a probe of the response of MLCT states to the electronic environment.

Transient resonance Raman investigation of excited states of [Ru(phen)2dppz]2+ and deuterated analogues in aqueous and non-aqueous environments

2000 ◽  
Vol 31 (4) ◽  
pp. 283-288 ◽  
Author(s):  
Colin G. Coates ◽  
Philip L. Callaghan ◽  
John J. McGarvey ◽  
John M. Kelly ◽  
Paul E. Kruger ◽  
...  
Keyword(s):  
Excited States ◽  
Resonance Raman ◽  
Aqueous Environments ◽  
Transient Resonance

Resonance Raman studies of Escherichia coli sulfite reductase hemoprotein. 3. Bound ligand vibrational modes

Biochemistry ◽  
1989 ◽  
Vol 28 (13) ◽  
pp. 5477-5485 ◽  
Author(s):  
Sanghwa Han ◽  
John F. Madden ◽  
Lewis M. Siegel ◽  
Thomas G. Spiro
Keyword(s):  
Escherichia Coli ◽  
Resonance Raman ◽  
Sulfite Reductase ◽  
Vibrational Modes

Surface-Enhanced Resonance Raman Spectra Study of α,β,γ,δ-Tetra-(4-Trimethyl Ammonium Phenyl) Porphyrin

1993 ◽  
Vol 47 (3) ◽  
pp. 292-295 ◽  
Author(s):  
Jian Chen ◽  
Ji-Ming Hu ◽  
Zhi-San Xu ◽  
Rong-Sheng Sheng
Keyword(s):  
Group Theory ◽  
Phenyl Ring ◽  
Resonance Raman ◽  
Vibrational Modes ◽  
Molecular Symmetry ◽  
Resonance Raman Scattering ◽  
Porphyrin Macrocycle ◽  
Surface Enhanced ◽  
Ag Colloid ◽  
Resonance Raman Spectra

In the present study, surface-enhanced resonance Raman scattering (SERRS) spectra of α,β,γ,δ-tetra-(4-trimethyl ammonium phenyl) porphyrin [T(4-TAP)P] were obtained. With increasing pH, the relative intensities of the bands at 890 and 1244 cm−1 decreased. These bands were attributed to γ(C-H) and δ(Cm-phenyl), respectively. The bands at 420 and 576 cm−1, which were assigned to γ(phenyl-ring), were enhanced. The molecular symmetry of T(4-TAP)P is discussed in terms of group theory. The bands at 1554 and 1496 cm−1 could be attributed to the vibrational modes of the porphyrin macrocycle; the bands at 1460, 1362, and 1330 cm−1 were assigned to ν(C-C) + δ(C-H), ν(C-N) + δ(C-H), and ν(C-N), respectively. All these bands change in band intensities, positions and widths, with the potential changing from +0.2 V to −0.2 V. It was concluded that the adsorbed porphyrins underwent partial incorporation with Ag from the electrode, and the adsorbate assumed a flat orientation on the silver electrode as well as the Ag colloid surface.

Transient Resonance Raman Spectroscopy of a Light-Driven Sodium-Ion-Pump Rhodopsin from Indibacter alkaliphilus

2017 ◽  
Vol 121 (17) ◽  
pp. 4431-4437 ◽  
Author(s):  
Kousuke Kajimoto ◽  
Takashi Kikukawa ◽  
Hiroki Nakashima ◽  
Haruki Yamaryo ◽  
Yuta Saito ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Sodium Ion ◽  
Ion Pump ◽  
Transient Resonance

Photochemistry of triphenylamine (TPA) in homogeneous solution and the role of transient N-phenyl-4a,4b-dihydrocarbazole. A steady-state and time-resolved investigation.

2021 ◽  
Author(s):  
Stefano Protti ◽  
Mariella Mella ◽  
Sergio Mauricio Bonesi
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Homogeneous Solution ◽  
Laser Flash ◽  
Time Resolved ◽  
Homogeneous Media

Abstract. The photoreactivity of triphenylamine in homogeneous media has been investigated by means of laser flash photolysis spectroscopy and preparative experiments. The goal of this study consists in the evaluation...

scholarly journals Microwave Spectra of Furazan. III. Rotation Spectra of Vibrationally Excited States

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1117-1130
Author(s):  
Otto L. Stiefvater
Keyword(s):  
Excited States ◽  
Heterocyclic Compound ◽  
Microwave Spectroscopy ◽  
Vibrational Modes ◽  
Vibrationally Excited ◽  
Rotational Constants ◽  
Rotational Spectra ◽  
Microwave Spectra

Abstract The pure rotational spectra of molecules in 21 vibrationally excited states of the heterocyclic compound furazan (C2H2N2O) have been detected and studied by DRM microwave spectroscopy. Rotational parameters are reported for the 12 fundamental levels below 1500 cm-1 , and the contri-butions from 10 vibrational modes to the effective rotational constants and to the inertia defect of furazan are calculated.

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