Magnetic circular dichroism spectroscopy of cobalt tetraphenyltetraacenaphthoporphyrin

Mack, John; Asano, Yukio; Kobayashi, Nagao; Stillman, Martin J.

doi:10.1016/j.jinorgbio.2007.10.031

Cited by 17 publications

(8 citation statements)

References 30 publications

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“…Not only S1 but also S2 emission are reported from time to time for porphyrinoids, [10] although the latter may need to be re-evaluated on the basis of a recent study, which called into question whether S2 emission is actually the result of an impurity generated by photodegradation. [11] As for the other Pc ligands that have been reported to date, [12][13][14] the Stokes Shift of the S1 emission is very small, while that of the apparent S2 emission is large. Compared with Pcs with normal substituent groups, the S1 emission appears at somehow longer wavelength and the quantum yields (Φ F = 0.12) are slightly smaller than those reported previously, since non radiative decay becomes easier with increasing wavelength.…”

Section: Compounds: (R)-and (S)-np 4 H 2 and Npmentioning

confidence: 82%

Fluorescence Detected Induced Circular Dichroism Observed for Optically Active Binaphthyl-Linked Metal-Free and Zinc Phthalocyanines

Kobayashi

2013

MHC

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Zinc and metal-free phthalocyanines (Pcs) with four optically active binaphthyl units on the periphery showed both fluorescence-detected circular dichroism (FDCD, and fluorescence detected induced circular dichroism (FDICD, (ФДКД, при 200-270 нм) так и флуоресцентно-детектируемый индуцированный круговой дихроизм (ФДИКД, при 270-700 нм). Для фталоцианинов с (R)-бинафтильными фрагментами сигнал ФДИКД положителен, а с (S)-бинафтильными -отрицателен.Ключевые слова: Оптически активные фталоцианины, флуоресцентно-детектируемый индуцированный круговой дихроизм, бинафтильные заместители.

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Section: Compounds: (R)-and (S)-np 4 H 2 and Npmentioning

confidence: 82%

Fluorescence Detected Induced Circular Dichroism Observed for Optically Active Binaphthyl-Linked Metal-Free and Zinc Phthalocyanines

Kobayashi

2013

MHC

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“…Because the Q 00 oscillator strength is so small, we know experimentally, and confirmed by the calculation, that the HOMO pair of orbitals must be close to degenerate. The TD-DFT calculation gives the ∆(HOMO) as 0.15 eV [26].…”

Section: Connection Between the Opti-cal Spectra Of Porphyrinoids Andmentioning

confidence: 99%

Application of magnetic circular dichroism spectroscopy to porphyrins, phthalocyanines and hemes

Tiedemann

Stillman

2011

J. Porphyrins Phthalocyanines

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INTRODUCTION TO THE MCD TECH-NIQUEMagnetic circular dichroism (MCD) spectroscopy developed from magnetic optical rotary dispersion (MORD) spectroscopy, a measure of the variation in the optical rotation of a substance with a change in the wavelength of plane polarized light [1]. The change to MCD spectroscopy was slow partly because it was easier to measure ORD and MORD spectra than CD and MCD spectra. However, the great value of the CD spectrum in structural analysis of both biomolecules and chiral inorganic complexes accelerated the switch as new instruments became available in the late 1960's [2]. The MCD spectrum also was easier to work with because of the direct connection of the MCD signal morphology and magnitude with readily computed state to state transition properties. This is because the group theory of the 1960's provided an interpretation of the sign and estimate of the relative magnitudes of particularly, transition metal complexes then being studied [3].The instrumental difficulties in measuring CD spectra were greatly reduced with the development of the acoustooptic modulator that allowed measurement in all regions ABSTRACT: This review of the application of the MCD spectroscopic technique to porphyrinoids aims to illustrate the features and unique information that can be obtained and used in the assignment of the optical absorption spectrum and also the electronic structures of porphyrins and phthalocyanines. By illustrating each of the major and readily available spectral features with simple compounds we hope this review will act to guide new users in formulating the questions that room temperature MCD measurements can answer. The review is in three parts: (i) a brief introduction to the instrumental and theoretical background with an emphasis on the parameters that can be readily extracted without computational or theoretical analyses. (ii) Illustration of each MCD spectral feature observed in room temperature spectra. The MCD spectra Zn-porphyrins and phthalocyanines, and chlorophyll a are described to provide models for measurements of new compounds. (iii) The use of "finger printing" to determine the oxidation and spin states of the central iron in heme proteins, and to identify the proximal (5th) and distal (6th) iron binding ligands from the MCD spectral envelope observed between 250 nm and 1000 nm. The value of this approach is immeasurable because through room temperature measurement of the MCD spectra from dilute solutions under conditions that allow the heme protein to be stabilized it is possible to identify accurately the proximal and distal ligands. Identifying the heme binding environment for heme proteins newly purified and for heme enzymes during their reaction cycle allows function to be considered long before X-ray structural analysis is available.

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“…These complexes display unique physical, spectroscopic and electrochemical properties, since the large conjugated p systems in these complexes are held in close proximity by metal ions [1]. The importance of these complexes in many fields such as optical devices, chemical sensors, semi-conductors, catalysts, non-linear optics, Langmuir-Blodgett films and photodynamic therapy (PDT) has increased rapidly as a result of novel designed compounds [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and electrochemical properties of novel pyridine phthalocyanine derivatives

Mızrak

Orman

Abdurrahmanoğlu

et al. 2018

J. Porphyrins Phthalocyanines

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ABSTRACT:In this study, the novel Zn(II), metal-free and sandwich-type Lu(Pc)2 phthalocyanines containing tetra pyridine substituted at peripheral position were synthesized. All the new compounds have been characterized by FT-IR and UV-vis spectroscopy, 1 H-NMR, MALDI-MS and elemental analysis. The electrochemical and spectroelectrochemical properties of all novel metallo-and metal free phthalocyanine compounds were also investigated by voltammetric and in situ spectroelectrochemical measurements on Pt in dimethylsulfoxide/tetrabutylammonium perchlorate.

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Magnetic circular dichroism spectroscopy of cobalt tetraphenyltetraacenaphthoporphyrin

Cited by 17 publications

References 30 publications

Fluorescence Detected Induced Circular Dichroism Observed for Optically Active Binaphthyl-Linked Metal-Free and Zinc Phthalocyanines

Fluorescence Detected Induced Circular Dichroism Observed for Optically Active Binaphthyl-Linked Metal-Free and Zinc Phthalocyanines

Application of magnetic circular dichroism spectroscopy to porphyrins, phthalocyanines and hemes

Synthesis, characterization and electrochemical properties of novel pyridine phthalocyanine derivatives

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