Fluorescence of zinc and magnesium etioporphyrin. I. Quenching and wavelength shifts due to complex formation

Whitten, David G.; Lopp, Irene G.; Wildes, Peter D.

doi:10.1021/ja01028a003

Cited by 48 publications

(25 citation statements)

References 5 publications

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“…It has been well documented that changes in the conjugation pathway and symmetry of a porphyrin can affect its UV/Vis absorption spectrum (Gouterman, 1961;Whitten et al 1968;Smith, 1976;Dolphin, 1978;Nappa & Valentine, 1978;Rubio et al 1999). …”

Section: Uv-vis Spectra Of Porphyrinsmentioning

confidence: 99%

The Use of Spectrophotometry UV-Vis for the Study of Porphyrins

Giovannetti¹

2012

Macro to Nano Spectroscopy

140

138

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Section: Uv-vis Spectra Of Porphyrinsmentioning

confidence: 99%

The Use of Spectrophotometry UV-Vis for the Study of Porphyrins

Giovannetti¹

2012

Macro to Nano Spectroscopy

140

138

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“…20,21 The quencher concentration equals the ligand concentration added after the occurrence of fluorescence quenching. For example, 1•DABCO-DABCO means 1 plus two equiv.…”

Section: Photophysical Changes Of 1 Regulated By N-containing Ligandsmentioning

confidence: 99%

Dynamic Assemblies and Photophysical Changes of Zinc Porphyrin Dimer Regulated by N‐Containing Ligands

Zhou

Zhu

et al. 2007

Chin. J. Chem.

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Zinc porphyrin dimer (1) has been designed and synthesized as a novel host of N-containing ligands. The assembly behavior and photophysical changes of its host-guest complexes were evaluated by 1 H NMR, fluorescence, and UV-visible titrations, and the processes reveal that the host-guest assembly first creates a stable sandwich complex, then an axial coordination equilibrium appears between the sandwich complex and free ligand. The changes of absorption spectra of the assembly processes rely on the stabilities of the complexes, and fluorescence quenching depends on the axial coordination equilibrium, which indicates that the axial ligation/de-ligation dynamics is indeed a pathway from the excited state to the ground state for metalloporphyrin complexes.

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“…Mg.porphin is a powerful catalyst able to form charge transfer complexes with a number of different kinds of molecules [15,[16][17]. With acetylene the ligand is positively charged (0.08) and the porphin has a negative charge.…”

Section: A Total Energies (Hartrees)mentioning

confidence: 99%

A Prebiotic Surface Catalysed Photochemically Activated Synthesis of L-Cysteine

Aylward¹

2017

Proceedings of the 2016 International Conference on Biological Engineering and Pharmacy (BEP 2016)

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Abstract-Ethyne forms a weak charge-transfer complex with surface catalysts such as Mg.porphin in which the ethyne group has a net positive charge (0.08), and the conjugated porphin has a negative charge. This neutral complex is polarised and undergoes a nucleophilic addition reaction with ammonia at the carbene carbon to form Mg.2-amino ethenyl.porphin which has a tendency to the formation of cyclic Mg.1H aziridin-2yl.porphin complex. Nucleophilic attack by hydrosulfide anion ultimately yields a complex of bound 2-mercapto ethanimine. When the imine is bound to a Mg.porphin complex in which carbon monoxide has been oriented by exciting radiation an aziridine-2one complex is formed hydrolysable to the amino acid L-cysteine. The reactions have been shown to be feasible from the overall enthalpy changes in the ZKE approximation at the HF and MP2 /6-31G* level.

show abstract

Fluorescence of zinc and magnesium etioporphyrin. I. Quenching and wavelength shifts due to complex formation

Cited by 48 publications

References 5 publications

The Use of Spectrophotometry UV-Vis for the Study of Porphyrins

The Use of Spectrophotometry UV-Vis for the Study of Porphyrins

Dynamic Assemblies and Photophysical Changes of Zinc Porphyrin Dimer Regulated by N‐Containing Ligands

A Prebiotic Surface Catalysed Photochemically Activated Synthesis of L-Cysteine

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