Synthesis, Characterization and Photophysical Properties of Rhenium(I) Complexes Containing 4,5-Diazafluorene Ligan

2011 ◽  
Vol 239-242 ◽  
pp. 2612-2615
Author(s):  
Jie Xiu Wang ◽  
Feng Zhao
Keyword(s):  
Charge Transfer ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Absorption And Fluorescence Spectra ◽  
Rhenium Complexes ◽  
H Nmr ◽  
Ligand Charge Transfer

Two related tricarbonyl rhenium complexes with the formula of [Re(CO)3(L)Cl], where L=4,5-diazafluoren-9-one (Dafo-Re) and 9-(phenylamino)-4,5-diazafluoren (PADF-Re) were successfully synthesized with the aim to explore the effect of the geometry of Dafo on Rhenium(I) coordination, and characterized by1H NMR. Photophysical behaviors are investigated by UV–vis absorption and Fluorescence spectra. The two complexes Dafo-Re and PADF-Re show metal-to-ligand charge transfer absorptions at ca.391nm, ca.394 nm and emissions at ca.492nm, ca.470nm, respectively.

Synthesis, Characterization and Photophysical Properties of Thiophene-Containing Chloro Re(I) Complex

2010 ◽  
Vol 146-147 ◽  
pp. 869-872
Author(s):  
Jie Xiu Wang ◽  
Feng Zhao
Keyword(s):  
Charge Transfer ◽  
Electron Density ◽  
1H Nmr ◽  
Photophysical Properties ◽  
Red Shift ◽  
Rhenium Complexes ◽  
Diimine Ligands ◽  
Ligand Charge Transfer

Two tricarbonyl rhenium complexes with the formula of [Re(CO)3(L)Cl], where L=1,10-phenanthroline (Phen-Re) and 2-(3-thienyl)-imidazo[4,5-f]-1,10-phenanthroline (TIPh-Re), were successfully synthesized and characterized by 1H NMR and UV–Vis with the aim to analyze the effect of the thiophene(TI) moiety on the photophysical properties of TIPh-Re. It was found that the introduction of an π-electron density moiety into diimine ligands leads to a dramatic red shift of the absorption of the corresponding Re(I) complex. At the same time, the results verify that the triplet metal-to-ligand charge-transfer dπ(Re)→π*(N-N) emission (3MLCT) of Phen-Re and TIPh-Re centered at ca. 566 nm and ca.569 nm, respectively.

Synthesis, Electronic States, and Electroluminescent Properties of Aluminum Complex Based on Mixed Ligands with 8-Hydroxyquinolinate and Acetylacetone

2011 ◽  
Vol 306-307 ◽  
pp. 358-361
Author(s):  
Liu Qing Chen ◽  
Chun Yan Sun ◽  
Xu Guang Liu ◽  
Bing She Xu
Keyword(s):  
Fluorescence Spectra ◽  
Orbital Energy ◽  
Computational Studies ◽  
Absorption And Fluorescence Spectra ◽  
Aluminum Complex ◽  
Analysis Techniques ◽  
H Nmr ◽  
Mixed Ligands ◽  
Organic Electroluminescent ◽  
Electron Transport Properties

We report the synthesis, photophysical investigation, computational studies and electroluminescent(EL) properties of an organic electroluminescent material-Bis(8-hydroxyQuino line) acetylacetone aluminum (Alq2A). It is characterized by 1H NMR, IR and elemental analysis techniques. The absorption and fluorescence spectra of various Alq2A systems including solution in ethanol, powder and thin film on quartz (thickness of 50nm) have also been systematically evaluated. Analysis of the electronic structure of Alq2A calculated by quantum chemical calculations reveals a localization of orbital and the distribution of orbital energy. The results from EL experiments indicate that Alq2A has good electron transport properties as compared with tris(8-hydroxyquinolinato) aluminum (Alq3). Thus, Alq2A is considered to be a superior emitter and electron transporting material for display application compared with Alq3.

Synthesis, Characterization and Optical Properties Based on a Novel Re(I) Emitter with Bulky Building Block

2011 ◽  
Vol 295-297 ◽  
pp. 373-377 ◽  
Author(s):  
Tie Nan Zang ◽  
Xiao Li ◽  
Lian Shui Yu ◽  
Ji Ping Ru ◽  
Hai Jun Chi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photophysical Properties ◽  
Decomposition Temperature ◽  
Organic Light Emitting Diodes ◽  
Absorption Bands ◽  
Light Emitting ◽  
H Nmr ◽  
Rhenium Complex ◽  
Organic Light ◽  
Ligand Charge Transfer

A novel rhenium complex material, i.e., Re-APPP, (APPP, 2,3-acenaphtho[1,2-b]pyrazino [2,3-f][1,10]phenanthroline) was designed, synthesized in five steps from commercially available starting materials and characterized by FTIR,1H NMR and mass spectroscopy. The photophysical properties of this complex were studied. The absorption bands centered at ca. 326, 366 and 450nm of Re-APPP were attributed to the ligand-centered p→p* transition and the metal-to-ligand charge transfer dπ(Re)→π*(APPP) transition, respectively. Re-APPP was thermally stable with high decomposition temperature of 302°C. The organic light-emitting diodes using Re-APPP as a dopant emitter with the structures of ITO/m-MTDATA(10nm)/NPB(20nm)/CBP: Re-APPP(30nm)/BCP(10nm)/Alq3(30nm)/LiF(1nm)/Al(100nm) were fabricated and a broad electroluminescent peak at 550nm was observed. More importantly, the devices exhibited very small efficiency roll-off of only ca.45% which was probably attributed to its short luminescent lifetime.

A naked-eye, selective and sensitive chemosensor for fluoride ion

2010 ◽  
Vol 64 (6) ◽  
Author(s):  
Puhui Xie ◽  
Fengqi Guo ◽  
Weifeng Wang ◽  
Xiyang Liu
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Fluorescence Spectra ◽  
Color Change ◽  
Fluoride Ion ◽  
Absorption And Fluorescence Spectra ◽  
Strong Fluorescence ◽  
Naked Eye ◽  
Acridine Yellow ◽  
Intermolecular Charge Transfer

AbstractEffect of the addition of six different anions on the absorption and fluorescence spectra of acridine yellow G (AYG) was examined. Only the F− anion could induce a visible color change observable with naked eye and a strong fluorescence quenching with K SV of 8.3 × 104 mol−1 L in CH3CN solutions. Calculated results of the interaction between the F− anion and acridine yellow G using the B3LYP/6-31G(d) program showed that the intermolecular charge transfer through the formation of an H-bond between AYG and F− is an essential sensor mechanism.

scholarly journals Pyridinium 5-aminothiazoles: specific photophysical properties and vapochromism in halogenated solvents

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 18132-18135 ◽  
Author(s):  
Kirara Yamaguchi ◽  
Toshiaki Murai ◽  
Yuki Tsuchiya ◽  
Yohei Miwa ◽  
Shoichi Kutsumizu ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Absorption And Fluorescence Spectra ◽  
Halogenated Solvents

Pyridinium-5-aminothiazoles exhibited bathochromically shifted absorption and fluorescence spectra, solvatochromism, and a reversible vapochromism specific to halogenated solvents.

How to interpret absorption and fluorescence spectra of charge transfer states in an organic solar cell

2018 ◽  
Vol 5 (5) ◽  
pp. 837-848 ◽  
Author(s):  
Frank-Julian Kahle ◽  
Alexander Rudnick ◽  
Heinz Bässler ◽  
Anna Köhler
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Solar Cell ◽  
Organic Solar Cells ◽  
Organic Solar Cell ◽  
Fluorescence Spectra ◽  
Photoluminescence Spectra ◽  
Absorption And Fluorescence Spectra ◽  
Energetic Disorder

Energetic disorder is crucial to consistently model both absorption and photoluminescence spectra of charge transfer states in organic solar cells.

Metal-to-Ligand Charge Transfer Excited States in π-Conjugated Systems

2001 ◽  
Vol 665 ◽  
Author(s):  
Yiting Li ◽  
C. Ed Whittle ◽  
Keith A. Walters ◽  
Kevin D. Ley ◽  
Kirk S. Schanze
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Excited States ◽  
Transition Metal Complexes ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Conjugated Oligomers ◽  
Conjugated Systems ◽  
Ligand Charge Transfer

ABSTRACTThis paper overviews recent work that examined the optical properties of mono-disperse, PPE-based π-conjugated oligomers that contain a 2,2-bipyridine-5,5'-diyl metal coordinating unit. The photophysical properties of the free oligomers and metallated oligomers that contain the -Ru(bpy)22+ and -Re(CO)3Cl transition metal complexes coordinated to the bpy-diyl unit have been characterized by absorption, photoluminescence and transient absorption spectroscopy. In addition, we report the photophysics of a novel organometallic “square” that features “sides” consisting of a PPE-type π-conjugated oligomer and “corners” that consist of (dbubpy)PtII(acetylide)2 units (where dbubpy = 4,4'-di-tert-butyl-2,2'-bipyridine).

scholarly journals Ruthenium(II)-bis(4′-(4-ethynylphenyl)-2,2′:6′, 2″-terpyridine) — A versatile synthon in supramolecular chemistry. Synthesis and characterization

2011 ◽  
Vol 9 (6) ◽  
pp. 990-999 ◽  
Author(s):  
Ronald Siebert ◽  
Florian Schlütter ◽  
Andreas Winter ◽  
Martin Presselt ◽  
Helmar Görls ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Supramolecular Chemistry ◽  
Photophysical Properties ◽  
Resonance Raman Spectroscopy ◽  
Bathochromic Shift ◽  
Resonance Raman ◽  
Electronic Effects ◽  
Charge Transfer Transition ◽  
Click Reactions ◽  
Ligand Charge Transfer

AbstractA homoleptic ethynyl-substituted ruthenium(II)-bisterpyridine complex representing a versatile synthon in supramolecular chemistry was synthesized and analyzed by NMR spectroscopy, mass spectrometry and X-ray diffractometry. Furthermore, its photophysical properties were detailed by UV/Vis absorption, emission and resonance Raman spectroscopy. In order to place the results obtained in the context of the vast family of ruthenium coordination compounds, two structurally related complexes were investigated accordingly. These reference compounds bear either no or an increased chromophore in the 4′-position. The spectroscopic investigations reveal a systematic bathochromic shift of the absorption and emission maximum upon increasing chromophore size. This bathochromic shift of the steady state spectra occurs hand in hand with increasing resonance Raman intensities upon excitation of the metal-to-ligand charge-transfer transition. The latter feature is accompanied by an increased excitation delocalization over the chromophore in the 4′-position of the terpyridine. Thus, the results presented allow for a detailed investigation of the electronic effects of the ethynyl substituent on the metal-to-ligand charge-transfer states in the synthon for click reactions leading to coordination polymers.

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