Tuning of photochemical and photophysical properties of [RuII(2,2'-bipyridine)2Lx] complexes using nonchromophoric ligand variations

Inglez, Simone Delezuk; Lima, Francisco das Chagas Alves; Camilo, Mariana R.; Daniel, Juliana F. S.; Santos, Evania D.A.; Neto, Benedito dos Santos Lima; Carlos, Rose Maria

doi:10.1590/s0103-50532010000100023

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…In contrast, Rubpy is an organometallic dye, which emits long-lifetime (∼600 ns) phosphorescence through the excited triplet state. 39 However, the energy level of the excited triplet state of Rubpy (−3.934 eV) 40 was closely followed by the potential of GO conduction band (−4.70 eV). 41 Therefore, the quenching process by GO was a preferred pathway instead of the phosphorescence emission.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Study of Fluorescence Quenching Ability of Graphene Oxide with a Layer of Rigid and Tunable Silica Spacer

Xing

Zeng

et al. 2018

Langmuir

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The fluorescence quenching property of graphene oxide (GO) has been newly demonstrated and applied for fluorescence imaging and biosensing. In this work, a new nanostructure was designed for effectively studying the quenching ability of GO. The key element in this design is the fabrication of a layer of rigid and thickness adjustable silica spacer for manipulating the distance between the GO and fluorophores. First, a silica core modified with organic dye molecules was prepared, followed by the formation of a silica shell with a tunable thickness. Afterward, the GO was wrapped around silica nanoparticles based on the electrostatic interaction between the negatively charged GO and positively charged silica. The quenching efficiency of GO to different dye molecules was studied at various spacer thicknesses and varying concentrations of GO. Fluorescence lifetime of fluorophores was measured to determine the quenching mechanism. We found that the quenching efficiency of GO was still around 30% when the distance between dyes and GO was increased to more than 30 nm, which indicated the long-distance quenching ability of GO and confirmed the previous theoretical calculation. The quenching mechanisms were proposed schematically based on our experimental results. We expected that the proposed nanostructure could act as a feasible model for studying GO quenching property and shed light on designing GO-based fluorescence sensing systems.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Study of Fluorescence Quenching Ability of Graphene Oxide with a Layer of Rigid and Tunable Silica Spacer

Xing

Zeng

et al. 2018

Langmuir

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“…The Cl-Ru-Cl bond angle in complex 1 (94.25°) is comparable with the ruthenium(II) diamine dichloride complex (92.66°) in cis-[RuCl 2 (dppme)(2-diaminocyclohexane)] [51]. The O-Ru-O bond angles in complexes 2 and 3 (83.30° and 82.02°); respectively arecomparable with the ruthenium (II) diamine oxalate complex (78.70°) in [Ru(C 2 O 4 )(C 10 H 14 )(C 7 H 5 NO 4 )] [52].…”

Section: Theoretical Studiesmentioning

confidence: 99%

Soluble Cytotoxic Ruthenium(II) Complexes with 2-Hydrazinopyridine

Soliman

Attaby

Alajrawy

et al. 2019

Russ. J. Inorg. Chem.

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New water soluble Ru(II) binary complex [Ru(C 5 H 7 N 3 )(X)(H 2 O) 2 ] with 2-hydrazinopyridine and its ternary complexes with X = dichloride, oxalate, malonate or pyrophosphate ligands have been synthesized. The complexes have been characterized using elemental analyses, mass, IR, and UV-Vis. spectroscopies, cyclic voltammetry, magnetic susceptibility, and thermal analysis. The complexes are diamagnetic and the electronic spectral data showed that peaks are due to low spin octahedral Ru(II) complexes. The optimized structures of the complexes 1-4 indicate distorted octahedral geometry with bond angles around the ruthenium atom ranged from 80.44° to 99.64°. The values of the electronic energies (-635 to -1145 a.u.), the highest occupied molecular orbital energies (-0.181 to 0.073 a.u.) and lowest unoccupied molecular orbital energies (-0.056 to 0.167 a.u.) indicate the stability of the complexes. The complexes are polarized as indicated from the dipole moment values (9.39-14.27 Debye). The complexes have noticeable cytotoxicity with IC 50 (μM): 0.

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First- and second-row transition metal oxa-aza macrocyclic complexes: a DFT study of an octahedral conformation

et al. 2012

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A theoretical study of structures of the 1,7,1 l,17-tetraoxa-2,6,12,16-tetraaza-cycloeicosane ligand ([20]AneN(4)O(4)) coordinated to Fe(2+), Co(2+), Ni(2+), Ru(2+), Rh(2+), and Pd(2+) transition metals ions was carried out with the DFT/B3LYP method. Complexes were fully optimized in C(s) symmetry with the metal ions coordinated either to nitrogen (1a) or oxygen atoms (1b). For all the cases performed in this work, 1a was always more stable than 1b. Considering each row it is possible to see that the binding energy increases with the atomic number. The M(2+) cation binding energies increase in the following order: Fe(2+)

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Tuning of photochemical and photophysical properties of [RuII(2,2'-bipyridine)2Lx] complexes using nonchromophoric ligand variations

Cited by 7 publications

References 13 publications

Study of Fluorescence Quenching Ability of Graphene Oxide with a Layer of Rigid and Tunable Silica Spacer

Study of Fluorescence Quenching Ability of Graphene Oxide with a Layer of Rigid and Tunable Silica Spacer

Soluble Cytotoxic Ruthenium(II) Complexes with 2-Hydrazinopyridine

First- and second-row transition metal oxa-aza macrocyclic complexes: a DFT study of an octahedral conformation

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