Photoinduced isomerization and luminescence of fac-[Re(CO)3(ph2phen)(bpe)]+

Frin, Karina Passalacqua Morelli; Iha, Neyde Yukie Murakami

doi:10.1590/s0103-50532006000800026

Cited by 30 publications

(45 citation statements)

References 28 publications

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“…These complexes were synthesized according to the procedure previously reported for other fac -[Re(CO) 3 (NN)( trans -L)] + complexes. ,,,, …”

Section: Methodsmentioning

confidence: 99%

“…Usually, trans -stilbene like ligands ( trans -L) exhibit a trans -to- cis photoisomerization in the UV region via 1 π → π* trans ‑L excited states. , The coordination of trans -L to Re(I) extends the photoisomerization pathways to the visible, mainly via metal-to-ligand charge transfer ( 1 MLCT/ 3 MLCT) photosensitizations of the intraligand ( 3 IL trans ‑L ) 3 π → π* trans ‑L state. ,− The trans - cis photosensitization of such ligands have been successfully exploited in the photoregulation of DNA hybridizations as well as in the conversion of light into mechanical motion , and the search for new efficient trans - cis photosystems is a key element toward the development of molecular machines.…”

Section: Introductionmentioning

confidence: 99%

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Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)₃(NN)]⁺ Complexes

et al. 2018

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In this work, efficient trans ⇌ cis photoswitchings of 4-(4-cyano)styrylpyridine (stpyCN) coordinated to organometallic bipyridyl tricarbonyl rhenium(I) complexes, fac-[Re(CO)(NN)( trans-stpyCN)], where NN = 2,2'-bipyridine (bpy) or 4,4'-dimethyl-2,2'-bipyridine (dmb), are described. For both complexes, the true trans-to- cis quantum yields determined by H NMR spectroscopy are similar at 313, 334, and 365 nm irradiations (Φ ∼ 0.45), with a small decrease at 404 nm (Φ ∼ 0.37). The investigated complexes also exhibit significant quantum yields for the reversible cis-to- trans photoreactions (Φ = 0.22). The luminescent properties of these complexes were also analyzed in different media to elucidate a key role of the IL state in photophysical and photochemical processes, giving new insights on their intriguing photobehavior.

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“…These complexes were synthesized according to the procedure previously reported for other fac -[Re(CO) 3 (NN)( trans -L)] + complexes. ,,,, …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)₃(NN)]⁺ Complexes

et al. 2018

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“…The fac-[Re(CO) 3 (NN)(bpa)]PF 6 complexes (NN = phen, dpq and dppz) were prepared following the procedures described elsewhere. 19,24,52 Briefly, [ClRe(CO) 5 ] and an excess of the polypyridyl ligand were refluxed in toluene for 5-7 h to yield a yellow solid, fac-[ClRe(CO) 3 (NN)]. The products were collected by filtration and recrystallized from CH 2 Cl 2 solutions by slow addition of n-pentane.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

The photophysics of fac-[Re(CO)3(NN)(bpa)]+ complexes: a theoretical/experimental study

Sousa

Sampaio

Neto

et al. 2014

Photochem Photobiol Sci

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The influence of the polypyridyl ligand on the photophysics of fac-[Re(CO)3(NN)(bpa)](+), bpa = 1,2-bis-(4-pyridyl)ethane and NN = 1,10-phenanthroline (phen), pyrazino[2,3-f][1,10]-phenanthroline (dpq), and dipyrido[3,2-a:2'3'-c]phenazine (dppz) has been investigated by steady state and time-resolved emission spectroscopy combined with theoretical calculations using time-dependent density functional theory (TD-DFT). The fac-[Re(CO)3(phen)(bpa)](+) is a typical MLCT emitter in acetonitrile with ϕ = 0.11 and τ = 970 ns. The emission lifetime and quantum yield decrease significantly in fac-[Re(CO)3(dpq)(bpa)](+) (ϕ = 0.05; τ = 375 ns) due to the presence of a close lying dark charge transfer state located at the pyrazine ring of dpq, as indicated by TD-DFT data. The luminescence of these complexes is quenched by hydroquinone with kq = (2.9 ± 0.1) × 10(9) and (2.6 ± 0.1) × 10(9) L mol(-1) s(-1), respectively, for NN = phen or dpq. These values are increased respectively to (4.6 ± 0.1) × 10(9) and (4.2 ± 0.1) × 10(9) L mol(-1) s(-1) in the 1 : 1 H2O-CH3CN mixture. In this medium Stern-Volmer constants determined by steady-state and time-resolved measurements differ from each other, which is indicative of static quenching, i.e. the pre-association of hydroquinone and the complexes through hydrogen bonding between the remote N-atom in the bpa ligand (KA ≅ 1-2 × 10(1) L mol(-1)), followed by a concerted proton-electron transfer. In contrast to other investigated complexes, fac-[Re(CO)3(dppz)(bpa)](+) is weakly emissive in acetonitrile at room temperature (ϕ ≅ 10(-4)) and does not exhibit a rigidochromic effect. This photophysical behaviour as well as TD-DFT data indicate that the lowest lying triplet excited state can be described as (3)ILdppz. The results provide additional insight into the influence of the polypyridyl ligand on the photophysical properties of Re(I) complexes.

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“…In tricarbonylrhenium(I) complexes, the bands observed at 230-300 nm may be due to p ? p* transitions and the longwavelength absorption bands (above 350 nm) are assigned to MLCT transitions from Re(I) to p* (nbzen) [29,30]. (Table 4).…”

Section: General Characterizationmentioning

confidence: 99%

Tricarbonylrhenium(I) complexes with N,N′-bis(2- and 4-nitrobenzaldehyde)-1,2-diiminoethane Schiff base ligands: synthesis, spectroscopic and crystal structure studies

Mirkhani

Kia

Vartooni

et al. 2009

Transition Met Chem

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fac-[Re(CO) 3 (2-nben)Cl] and fac-[Re(CO) 3 (4-nbzen)Cl] complexes consisting of 2-nbzen = N,N 0 -bis(2-nitrobenzaldehyde)-1,2-diiminoethane and 4-nbzen = N,N 0 -bis(4-nitrobenzaldehyde)-1,2-diiminoethane were synthesized by the reaction of Re(CO) 5 Cl with nbzen ligands. These complexes were characterized by physico-chemical, spectroscopic methods and X-ray crystallography. The electrochemical behavior of the two complexes was investigated by cyclic voltammetry. In the crystal structure of [Re(CO) 3 (4-nbzen)Cl], the neighbouring molecules are linked together by intermolecular C-HÁÁÁCl interactions to form 1D extended chains along the b-axis.

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Photoinduced isomerization and luminescence of fac-[Re(CO)3(ph2phen)(bpe)]+

Abstract: O complexo fac- [Re(CO) 3 (ph 2 phen)(trans-bpe)]PF 6 , ph 2 phen = 4,7-difenil-1,10-fenantrolina e trans-bpe = trans-1, 2-bis(4-piridil) MLCT. The emission exhibits a hypsochromic shift associated with the rigidochromic effect.

Cited by 30 publications

References 28 publications

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)₃(NN)]⁺ Complexes

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)₃(NN)]⁺ Complexes

The photophysics of fac-[Re(CO)3(NN)(bpa)]+ complexes: a theoretical/experimental study

Tricarbonylrhenium(I) complexes with N,N′-bis(2- and 4-nitrobenzaldehyde)-1,2-diiminoethane Schiff base ligands: synthesis, spectroscopic and crystal structure studies

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Photoinduced isomerization and luminescence of fac-[Re(CO)3(ph2phen)(bpe)]+

Abstract: O complexo fac- [Re(CO) 3 (ph 2 phen)(trans-bpe)]PF 6 , ph 2 phen = 4,7-difenil-1,10-fenantrolina e trans-bpe = trans-1, 2-bis(4-piridil) MLCT. The emission exhibits a hypsochromic shift associated with the rigidochromic effect.

Cited by 30 publications

References 28 publications

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)3(NN)]+ Complexes

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)3(NN)]+ Complexes

The photophysics of fac-[Re(CO)3(NN)(bpa)]+ complexes: a theoretical/experimental study

Tricarbonylrhenium(I) complexes with N,N′-bis(2- and 4-nitrobenzaldehyde)-1,2-diiminoethane Schiff base ligands: synthesis, spectroscopic and crystal structure studies

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Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)₃(NN)]⁺ Complexes

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)₃(NN)]⁺ Complexes