Luminescent Metal Complexes: Diversity of Excited States

Vogler, Arnd; Kunkely, Horst

doi:10.1007/3-540-44447-5_3

Cited by 161 publications

(65 citation statements)

References 176 publications

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“…First of all, we assume the main contribution comes from the ligand-to-ligand π -π charge transfer, i.e., LLCT [23][24][25]. The second contribution comes from the electronic transition between p orbitals (filled orbitals) of coordinated O or N atoms and 5 s orbital (empty orbital) of Cd(II) ion, i.e., LMCT [26][27][28][29]. Simultaneously, there maybe appears a crossover between LLCT and LMCT in the system which may exist an energy transfer of π − p (O, N) -5 s (Cd)-π .…”

Section: Photophysical Propertymentioning

confidence: 99%

Crystal structure and fluorescence/phosphorescence of two novel Cd(II) coordination polymers

Niu

Jin

et al. 2006

Struct Chem

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Two novel Cd(II) coordination polymers [Cd 4 (C 6 H 4 O 2 N) 8 (H 2 O) 4 ] n (1) and [Cd 2 (C 10 H 2 O 8 )(H 2 O) 6 ] n (2) have been synthesized under hydrothermal condition and structurally characterized. Crystal data: (1), orthorhombic, Pbca, a = 11.4494(19)(2), triclinic, P1, a = 5.5962(7) Å, b = 7.7758(6) Å, c = 9.6975(10) Å, α = 111.981(5) • , β = 101.649(6) • , γ = 98.240(5) • , V = 371.95(7) Å 3 , Z = 2, D calc = 2.603 g·cm −3 . Complex (1) possesses threedimensional infinite structure, while complex (2) adopts two-dimensional layers and the layers are connected by the many types of hydrogen bonds, forming three-dimensional network. Study results of the photophysical properties show that both complexes can emit strong blue fluorescence and complex (1) also emits phosphorescence (λ pl max = 511 nm, τ = 32 ms) in the solid state at room temperature.

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Section: Photophysical Propertymentioning

confidence: 99%

Crystal structure and fluorescence/phosphorescence of two novel Cd(II) coordination polymers

Niu

Jin

et al. 2006

Struct Chem

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“…In this context, the molecular structures and luminescent properties of a large number of coordination compounds have been investigated [7][8][9][10]. Using ligands in combination with metal ions is a good choice for attaining a proper structural design for a specific application [11,12]. Recent efforts have been devoted to understand the correlation between the electronic structure and photonic properties of metal complexes of main and transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

Structure and Photoluminescence Properties of a New Nanostructure Tin(IV) Complex: A Precursor for Preparation of Pure Phase Nanosized SnO2

Amini

Najafi

Poor

et al. 2015

J Inorg Organomet Polym

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A new tin complex, [l-(4-bpdb){Me 2 Sn(cupf) 2 } 2 ] (1), was prepared by reacting dimethyltin(IV) dichloride, with 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene (4-bpdb) and cupferron in a fast and facile process. The complex was fully characterized based on its 1 H and 13 C NMR, IR, and UV spectra and elemental analysis. The nanostructure of the prepared compound was synthesized by the sonochemical method. The new nanostructure was characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), IR spectroscopy and elemental analysis. Thermal stability of single crystalline and nanosize samples of the prepared compound was studied by thermal gravimetric and differential thermal analysis. The prepared complexes, as bulk and as nanoparticles, were utilized as a precursor for preparation of SnO 2 nanoparticles by direct thermal decomposition at 600°C in air. The morphology and size of the SnO 2 nanoparticles were determined by scanning electron microscopy, XRD and IR spectroscopy and the results showed that particle size of the SnO 2 nanoparticle depend on the initial particles size of 1. Photoluminescence properties of the nanostructured and crystalline bulk of the prepared complex and SnO 2 nanoparticles core of them were investigated.

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“…It is clear from these reports that a detailed understanding of the relationship between the ligand structure and optical properties of the resulting Al-complex is essential to make progress in the improvement of OLED devices. The optical properties of mer-Alq3 -type derivatives are dominated by the ligand centered excited states [37], which originate from the electronic π-π* transitions in the quinolinolate ligands [38] and HOMO and LUMO orbitals are located on the phenoxide side of the ligand and on the pyridyl side of the ligand respectively [40][41][42]. This indicates that the substituent attached to the quinolinolate ligand plays an important role in tuning the emission of the Al-complex.In general electron donating groups attached to pyridine ring cause a blue shift in the emission while the introduction to phenoxide ring cause a red shift [43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Push-pull effect on the geometrical, optical and charge transfer properties of disubstituted derivatives of mer-tris(4-hydroxy-1,5-naphthyridinato) aluminum (mer-AlND3)

Rao

Bhanuprakash

2016

Open Chemistry

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Push-pull effect on the geometrical, optical and charge transfer properties of disubstituted derivatives of mer-tris(4-hydroxy-1,5-naphthyridinato) aluminum (mer-AlND3) DOI: 10.1515/chem-2016-0001 received April 23, 2015 accepted November 14, 2015. Abstract: To design innovative and novel optical materials with high mobility, two kinds of disubstituted derivatives for mer-tris(4-hydroxy-1,5-naphthyridinato) aluminum (mer-AlND3) with push (EDG)-pull (EWG) substituents have been designed. The structures of mer-tris(8-EDG-2-EWG-4-hydroxy-1,5-naphthyridinato) aluminum (type I) and mer-tris(8-EWG-2-EDG-4-hydroxy-1,5-naphthyridinato) aluminum (type II) in the ground and first excited states have been optimized at the B3LYP/6-31G(D) and CIS/6-31G(D) level of theory, respectively. It can be seen from frontier molecular orbitals analysis, in all these complexes, the highest occupied molecular orbital (HOMO) is localized on the pyridine-4-ol ring of A-ligand while lowest unoccupied molecular orbital (LUMO) is on the pyridyl ring of B-ligand in ground state irrespective of electron donor/acceptor substitution present on the ligands similar to that of mer-tris(8-hydroxyquinoline) aluminum (mer-Alq3) and parent mer-AlND3.The absorption and emission wavelengths have been evaluated at the TD-PBE0/6-31G(D) level and it can be see that all the type I derivatives show blue shift while most of the type II derivatives show red shift compared to mer-AlND3. All the disubstituted complexes have showed hypsochromic shifts in both the absorption and emission spectra when compared with the calculated absorption and emission spectra respectively of mer-Alq3. It can be seen that the reorganization energies of some of the disubstituted derivatives are comparable with merAlq3 and these derivatives might be good candidates for emitting materials in OLED.

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Luminescent Metal Complexes: Diversity of Excited States

Cited by 161 publications

References 176 publications

Crystal structure and fluorescence/phosphorescence of two novel Cd(II) coordination polymers

Crystal structure and fluorescence/phosphorescence of two novel Cd(II) coordination polymers

Structure and Photoluminescence Properties of a New Nanostructure Tin(IV) Complex: A Precursor for Preparation of Pure Phase Nanosized SnO2

Push-pull effect on the geometrical, optical and charge transfer properties of disubstituted derivatives of mer-tris(4-hydroxy-1,5-naphthyridinato) aluminum (mer-AlND3)

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