Synthesis, structure and luminescent properties of rhenium(I) carbonyl complexes containing pyrimidine-functionalized N-heterocyclic carbenes

Wang, Gaofeng; Liu, Yuanzhong; Chen, Xue-Tai; Zheng, You‐Xuan; Xue, Zi‐Ling

doi:10.1016/j.ica.2012.09.008

Cited by 23 publications

(21 citation statements)

References 46 publications

(47 reference statements)

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“…See SI, Table S1-6, for complete tables of bond lengths and angles. a From air-equilibrated solutions; b from degassed solution; c rhodamine 101 in airequilibrated ethanol used as the reference; d [Ru(bpy) 3 ]Cl 2 in air-equilibrated water used as the reference; e 3Cl was previously reported, 16 however we note slightly different values with respect to the lifetime decays values. obtained by exciting the complexes to their lowest energy λ abs .…”

Section: 39mentioning

confidence: 71%

“…With the intent to investigate the effect that the exchange of a diim for a NHC ligand would have on the luminescent properties of tricarbonyl Re complexes, our group and others have investigated the photophysical behavior of this class of compounds, where the NHC ligand is based around a pyridyl, pyrimidyl or quinolyl-substituted imidazole or benzimidazole ring. [14][15][16] The findings have revealed that this type of NHC ligands are able to activate tuneable metal-to-ligand charge transfer (MLCT) transitions through their π* system, upon which phosphorescent decay to the ground state (GS) is then observed ( 3 MLCT → GS).…”

Section: -13mentioning

confidence: 99%

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Photophysical and Photochemical Trends in Tricarbonyl Rhenium(I) N-Heterocyclic Carbene Complexes

et al. 2014

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A family of tricarbonyl Re(I) complexes of the formulation fac-[Re(CO)3(NHC)L] has been synthesized and characterized, both spectroscopically and structurally. The NHC ligand represents a bidentate N-heterocyclic carbene species where the central imidazole ring is substituted at the N3 atom by a butyl, a phenyl, or a mesityl group and substituted at the N1 atom by a pyridyl, a pyrimidyl, or a quinoxyl group. On the other hand, the ancillary L ligand alternates between chloro and bromo. For the majority of the complexes, the photophysical properties suggest emission from the lowest triplet metal-to-ligand charge transfer states, which are found partially mixed with triplet ligand-to-ligand charge transfer character. The nature and relative energy of the emitting states appear to be mainly influenced by the identity of the substituent on the N3 atom of the imidazole ring; thus, the pyridyl complexes have blue-shifted emission in comparison to the more electron deficient pyrimidyl complexes. The quinoxyl complexes show an unexpected blue-shifted emission, possibly occurring from ligand-centered excited states. No significant variations were found upon changing the substituent on the imidazole N3 atom and/or the ancillary ligand. The photochemical properties of the complexes have also been investigated, with only the complexes bound to the pyridyl-substituted NHC ligands showing photoinduced CO dissociation upon excitation at 370 nm, as demonstrated by the change in the IR and NMR spectra as well as a red shift in the emission profile after photolysis. Temperature-dependent photochemical experiments show that CO dissociation occurs at temperatures as low as 233 K, suggesting that the Re-C bond cleaves from excited states of metal-to-ligand charge transfer nature rather than thermally activated ligand field excited states. A photochemical mechanism that takes into account the reactivity of the complexes bound to the pyridyl-NHC ligand as well as the stability of those bound to the pyrimidyl- and quinoxyl-NHC ligands is proposed.

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Section: 39mentioning

confidence: 71%

Section: -13mentioning

confidence: 99%

Photophysical and Photochemical Trends in Tricarbonyl Rhenium(I) N-Heterocyclic Carbene Complexes

et al. 2014

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“…One is the contribution of MLCT ( 3 MLCT) in T 1 state [60]. A larger 3 MLCT can enhance SOC, which can result in a drastic decrease of radiative lifetime and avoid nonradiative process [61][62], which is good for increasing k r . The second aspect is the energy gap between S 1 and T 1 states (E S1-T1 ) [63][64][65][66].…”

Section: The Emission Quantum Yield In Ch 2 CL 2 Mediamentioning

confidence: 99%

“…Among these phosphorescent materials, the blue counterparts have relatively inferior performance in terms of color purity, luminous efficiency and durability. To obtain higher phosphorescence efficiency, the heavy transition metal with d 6 configuration complexes, such as rhenium(I), osmium(II), iridium(III) and ruthenium(II), were investigated extensively as electron luminescent emitters of OLEDs in experimental and theoretical studies [3][4][5][6][7][8][9]. This is due to the heavy-atom-induced strong spin-orbit coupling (SOC) effect, which leads to partially allowed intersystem crossing (ISC) and phosphorescence.…”

Section: Introductionmentioning

confidence: 99%

“…And rich variety of researches have successfully proven that properties of transition metal complexes are varied by the introduction of differently functional groups, such as electron-donating groups (-NH 2 , -OCH 3 , -CH 3 ) or -withdrawing groups (-F,-Cl, -CN, -NO 2 ) [23][24][25][26][27]. Recently, the photophysical properties of mononuclear and dinuclear tricarbonyl rhenium(I) tetrazolato complexes and the indirect influence of the tetrazolato ancillary ligand in governing the relative energy of the 3 MLCT [5d(Re)→π*(diimine)] excited states via stabilization or destabilization of 5d orbitals of Re have been researched by Wright et al [28][29]. As a continuation of the work, fac-[Re (CO) 3 (L)(N^N)] (L = Cl or Br; N^N = tert-butylated pyridyltetrazole) were successfully synthesized [30].…”

Section: Introductionmentioning

confidence: 99%

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The effect of group-substitution on structures and photophysical properties of rhenium(I) tricarbonyl complexes with pyridyltetrazole ligand: A DFT/TDDFT study

Yang

Wang

Guo

et al. 2016

Materials Chemistry and Physics

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A series of rhenium(I) tricarbonyl complexes having a general formula fac-[Re (CO) 3 (L)(R-N^N)] (L = Br; N ∧ N = tert-butylated pyridyltetrazole; R=-H, 1;-NO 2 , 2;-CN, 3;-OCH 3 , 4;-CH 3 , 5) have been investigated theoretically by density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods. The calculated results reveal that introductions of different groups on R position of N^N ligand can induce changes on electronic structures, photophysical properties and emission quantum yield for these complexes. When the electron-withdrawing groups (-NO 2 and-CN) are introduced in complex 2 and 3, the lowest energy absorption and emission bands are red-shifted compared with that of 1. On the contrary, the introduction of electron-donating group (-OCH 3 and-CH 3) in complex 4 and 5 cause corresponding blue-shifted. For these complexes, the stronger electron-donating ability of introduced group on N^N ligand is, the larger blue-shifted of the lowest energy absorption and emission bands is. The solvent effect on absorption and emission spectrum indicates that the lowest-energy absorption and emission bands have both red shifts with the decrease of solvent polarity. The electronic affinity (EA), ionization potential (IP) and reorganization energy (λ) results show that complex 4 may be suitable to be used as an emitter in organic light-emitting diodes OLEDs. Meanwhile the emission quantum yield of complex 4 is possibly higher than other complexes.

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Metal–Carbonyl Units for Vibrational and Luminescence Imaging: Towards Multimodality

Clède

Policar

2014

Chemistry A European J

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Metal-carbonyl complexes are attractive structures for bio-imaging. In addition to unique vibrational properties due to the CO moieties enabling IR and Raman cell imaging, the appropriate choice of ancillary ligands opens up the opportunity for luminescence detection. Through a classification by techniques, past and recent developments in the application of metal-carbonyl complexes for vibrational and luminescence bio-imaging are reviewed. Finally, their potential as bimodal IR and luminescent probes is addressed.

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Synthesis, structure and luminescent properties of rhenium(I) carbonyl complexes containing pyrimidine-functionalized N-heterocyclic carbenes

Cited by 23 publications

References 46 publications

Photophysical and Photochemical Trends in Tricarbonyl Rhenium(I) N-Heterocyclic Carbene Complexes

Photophysical and Photochemical Trends in Tricarbonyl Rhenium(I) N-Heterocyclic Carbene Complexes

The effect of group-substitution on structures and photophysical properties of rhenium(I) tricarbonyl complexes with pyridyltetrazole ligand: A DFT/TDDFT study

Metal–Carbonyl Units for Vibrational and Luminescence Imaging: Towards Multimodality

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