Ligand steric effects on the photophysics of bis- and tris(2,2'-bipyridine) complexes of rhodium(III)

Nishizawa, Masato; Suzuki, Tomoya; Sprouse, S.; Watts, R.J.; Ford, Peter C.

doi:10.1021/ic00181a012

Cited by 57 publications

(25 citation statements)

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“…The emission from [Rh(bpy) 3 ] 3+ at 448 nm with a lifetime of 2.2 ms is only observed at low temperatures (77 K) in a rigid glass. 19 In 2001, a remarkable fluorescent rhodium-containing metallacycle complex, namely, 2,5-bis(ditolylethynyl) rhodacyclopentadienes was reported by Marder, Rourke et al 20 At that time, the group only briefly reported the photophysical properties of this complex. Until recently, the group reported comprehensive photophysical properties studies concerning this type of metallacycle rhodium fluorescent complex (Fig.…”

Section: Rhodiummentioning

confidence: 99%

An insight into fluorescent transition metal complexes

Chia

Tay

2014

Dalton Trans.

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The emission from transition metal complexes is usually produced from triplet excited states. Owing to strong spin-orbit coupling (SOC), the fast conversion of singlet to triplet excited states via intersystem crossing (ISC) is facilitated. Hence, in transition metal complexes, emission from singlet excited states is not favoured. Nevertheless, a number of examples of transition metal complexes that fluoresce with high intensity have been found and some of them were even comprehensively studied. In general, three common photophysical characteristics are used for the identification of fluorescent emission from a transition metal complex: emission lifetimes on the nanosecond scale; a small Stokes shift; and intense emission under aerated conditions. For most of the complexes reviewed here, singlet emission is the result of ligand-based fluorescence, which is the dominant emission process due to poor metal-ligand interactions leading to a small metal contribution in the excited states, and a competitive fluorescence rate constant when compared to the ISC rate constant. In addition to the pure fluorescence from metal complexes, another two types of fluorescent emissions were also reviewed, namely, delayed fluorescence and fluorescence-phosphorescence dual emissions. Both emissions also have their respective unique characteristics, and thus they are discussed in this perspective.

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Section: Rhodiummentioning

confidence: 99%

An insight into fluorescent transition metal complexes

Chia

Tay

2014

Dalton Trans.

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“…The tetranitrogenated 3,6-bis(2 -pyridyl)pyridazine (dppn) ligands are widely used to prepare some important complexes especially those of ruthenium(II) and rhodium(III) since these complexes act as photosensitizer for solar energy conversion which exhibit catalytic and biological properties [1][2][3][4][5][6]. The dppn ligand forms mononuclear and binuclear complexes [7].…”

Section: Introductionmentioning

confidence: 99%

High resolution ¹H and ¹³C NMR and mass spectral studies of substituted dipyridylpyridazine

El-Qisairi

2002

Journal of Spectroscopy

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Total assignment of the1H and13C NMR spectra of 3,6-bis(2'-pyridyl)pyridazine derivatives (n-dppn) have been recorded at 400 and 100 MHz, respectively.1Based on these data, the complete assignment of the13C NMR chemical shift values was made by a13C{1H} decoupling. The spectra clearly show that then-dppn ligands exist in thecis–cisconformation at least in solution. Matrix assisted laser desorption ionization (MALDI) and time-of-flight mass spectrometry (TOFMS) are used to record the mass spectra of then-dppn ligands. α-Cyano-4-hydroxycinnamic acid (CHCA) matrix promoted the molecular ion detection when 180 pmol ofn-dppn is introduced into the TOFMS.

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“…but the emission was either too faint, the complex couldn't compete with other species for the absorption of excitation light,23,29 and/or the emission was quenched by NAD + , and/or NADH. Fluorescent Microscopy was done using a Nikon Microphot -FXA instrument with a FXA/SA Epifluorescent attachment using UV excitation.…”

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confidence: 99%

Vesicle Encapsulation of a Nonbiological Photochemical System Capable of Reducing NAD⁺ to NADH

Summers

Rodoni

2015

Langmuir

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One of the fundamental structures of a cell is the membrane. Self-assembling lipid bilayer vesicles can form the membrane of an artificial cell and could also have plausibly assembled prebiotically for the origin of life. Such cell-like structures, that encapsulate some basic subset of the functions of living cells, are important for research to infer the minimum chemistry necessary for a cell, to help understand the origin of life, and to allow the production of useful species in microscopic containers. We show that the encapsulation of TiO2 particles has the potential to provide the basis for an energy transduction system inside vesicles which can be used to drive subsequent chemistry. TiO2 encapsulated in vesicles can be used to produce biochemical species such as NADH. The NADH is formed from NAD(+) reduction and is produced in a form that is able to drive further enzymatic chemistry. This allows us to link a mineral-based, nonbiological photosystem to biochemical reactions. This is a fundamental step toward being able to use this mineral photosystem in a protocell/artificial cell.

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Ligand steric effects on the photophysics of bis- and tris(2,2'-bipyridine) complexes of rhodium(III)

Cited by 57 publications

References 0 publications

An insight into fluorescent transition metal complexes

An insight into fluorescent transition metal complexes

High resolution ¹H and ¹³C NMR and mass spectral studies of substituted dipyridylpyridazine

Vesicle Encapsulation of a Nonbiological Photochemical System Capable of Reducing NAD⁺ to NADH

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Ligand steric effects on the photophysics of bis- and tris(2,2'-bipyridine) complexes of rhodium(III)

Cited by 57 publications

References 0 publications

An insight into fluorescent transition metal complexes

An insight into fluorescent transition metal complexes

High resolution 1H and 13C NMR and mass spectral studies of substituted dipyridylpyridazine

Vesicle Encapsulation of a Nonbiological Photochemical System Capable of Reducing NAD+ to NADH

Contact Info

Product

Resources

About

High resolution ¹H and ¹³C NMR and mass spectral studies of substituted dipyridylpyridazine

Vesicle Encapsulation of a Nonbiological Photochemical System Capable of Reducing NAD⁺ to NADH