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PubMed Journals Articles About "Important Role Coordination Geometry Photophysical Properties Blue Green" RSS

18:13 EDT 16th September 2019 | BioPortfolio

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Showing "Important Role Coordination Geometry Photophysical Properties Blue Green" PubMed Articles 1–25 of 45,000+

The Important Role of Coordination Geometry on Photophysical Properties of Blue-Green Emitting Ruthenium(II) Diisocyano Complexes Bearing 2-Benzoxazol-2-ylphenolate.

A series of blue-green emitting Ru diisocyano complexes containing 2-benzoxazol-2-ylphenolate (PBO) have been prepared. The complexes were isolated under varied reaction conditions in two isomeric forms, i.e., ,,- () and ,,- (), with varied ligand coordination geometry above the Ru center. The photoluminescence of the isomeric complexes has been compared and tuned by the systematic variation of the electronic properties of the isocyanides. The ,,- isomers exhibit structureless emission in the blue-green reg...


A series of blue-green-yellow-red emitting Cu(I) complexes: Molecular structure and photophysical performance.

In this work, we designed a series of [Cu(NN)(PPh)]BF complexes with different optical edge values and emission colors from blue to red, where NN and PPh denoted a diamine ligand and triphenylphosphine, respectively. Six NN ligands with various conjugation chains (short π chain, modest π chain and long π chain) were selected. A systematical comparison between these Cu(I) complexes was performed, so that the correlation between NN structure and [Cu(NN)(PPh)] photophysical performance was tentatively discu...

From deep blue to green emitting and ultralong fluorescent copper(i) halide complexes containing dimethylthiophene diphosphine and PPh ligands.

Highly emissive copper(i) halide complexes having thermally activated delayed fluorescence (TADF) have been paid much attention. Here, a series of four-coordinate mononuclear copper(i) halide complexes containing both bi- and mono-phosphine ligands, [CuX(dpmt)(PPh3)] (dpmt = 3,4-bis(diphenylphosphino)-2,5-dimethylthiophene, X = I (1), Br (2) and Cl (3)), were synthesized, and their molecular structures and photophysical properties were investigated. These complexes exhibit intense deep blue emission in crys...


Assessing the interlinkage of green and blue water in an arid catchment in Northwest China.

Water resource assessment is crucial for human well-being and ecosystem health. Assessments considering both blue and green water are of great significance, as green water plays a critical but often ignored role in the terrestrial ecosystem, especially in arid and semi-arid regions. Many approaches have been developed for green and blue water valuation; however, few approaches consider the interrelationship between green and blue water. This study proposed a new framework for green and blue water assessment...

Synthesis and structural, redox and photophysical properties of tris-(2,5-di(2-pyridyl)pyrrolide) lanthanide complexes.

A first series of lanthanide complexes of tris(dipyridyl)pyrrolide ligands has been prepared. The [Ln(dppR1,R2)3] complexes (Ln = La(iii), Sm(iii), Eu(iii), Gd(iii) and Yb(iii); and dppR1,R2 = 2,5-di(2-pyridyl-3-(R1)-4-(R2)) pyrrolide) have been isolated and their structures and photophysical and redox properties characterised, both in the solid-state and in solution. In the complexes, the three dpp- ligands form a distorted tricapped trigonal prismatic coordination geometry about the lanthanide ions, with ...

Using deep learning to examine street view green and blue spaces and their associations with geriatric depression in Beijing, China.

Residential green and blue spaces may be therapeutic for the mental health. However, solid evidence on the linkage between exposure to green and blue spaces and mental health among the elderly in non-Western countries is scarce and limited to exposure metrics based on remote sensing images (i.e., land cover and vegetation indices). Such overhead-view measures may fail to capture how people perceive the environment on the site.

Triggering White-Light Emission in a 2D Imine Covalent Organic Framework Through Lanthanide Augmentation.

Recently, Covalent Organic Frameworks (COFs) have emerged as an interesting class of porous materials, featuring tunable porosity and fluorescence properties based on reticular construction principles. Some COFs display highly emissive mono-colored luminescence, but, attaining white-light emission from COFs is difficult as it must account for a wide wave-length range. White-light emission is highly desired for solid state lighting applications and obtaining it usually demands the combination of red, green a...

Effects of Structural Variation in Conjugated Side Chains on the Photophysics of Conjugated Polymers in Nanoparticles.

Conjugated Polymers (CPs) are widely used for a variety of applications as a result of their high quantum yields, strong extinction coefficients, and good stability to a variety of experimental conditions. In many cases the use of conjugated polymer nanoparticles (CPNs) provides additional practical advantages. The ability to understand how the structure of the CP affects its photophysical properties has the potential to significantly accelerate research in this area. In this work we examine 3 CPs, includin...

Photophysical Identification of Three Kinds of Low-Energy Green Band Defects in Wide Bandgap Polyfluorenes.

Blue light emitting semiconductors based on polyfluorenes often exhibit an undesired green emission band. In this report, three well-defined oligofluorenes corresponding to three types of "defects" attributed to: aggregation, keto formation, and chain-entanglement, respectively, are systemically investigated to unveil the origins of the green emission band in fluorene-based materials. Firstly, the optical properties of defect molecules in different states are studied. The defect associated with aggregation ...

Tuning White Light Emission in Dinuclear Phenoxo Bridged Dy Complexes.

A new series of dinuclear dysprosium(III) complexes, [Dy(L)(NO)(MeOH)] (), [Dy(L)(NO)(DMF)]·2DMF (), [Dy(L)(NO)(DMF)]·2DMF (), and [Dy(L)(NO)(DMF)] (), with 2,2'-[[(2-pyridinylmethyl)imino]di(methylene)]bis(4-R-phenol), where R = CH, Cl, and CHO, were investigated as potential white light emitters. All octacoordinated dysprosium(III) are phenoxo-bridged species and have a similar coordination environment. Nevertheless, has a MeOH ligand molecule, while for - a DMF ligand replaces that of MeOH. The nature...

New electropolymerizable Ir(III) complexes with β-ketoiminate ancillary ligands.

A series of electropolymerizable cyclometallated Ir(III) complexes were synthesized and their electrochemical and photophysical properties studied. The triphenylamino electropolymerizable fragment was introduced by using triphenylamino-2-phenylpyridine and, respectively, triphenylamino-benzothiazole as cyclometalated ligands. The coordination sphere was completed by two differently substituted new β-ketoiminate ligands deriving from the condensation of acetylacetone or hexafluoroacetylecetone with p-bromoa...

New designs for phototherapeutic transition metal complexes.

In this minireview, we highlight recent advances in the design of transition metal complexes for photodynamic therapy (PDT) and photoactivated chemotherapy (PACT), and discuss the challenges and opportunities for the translation of such agents into clinical use. New designs for light-activated transition metal complexes offer photoactivatable prodrugs with novel targeted mechanisms of action. Light irradiation can achieve spatial and temporal control of drug activation, increasing selectivity and reducing s...

A simple method for the preparation of multi-color carbon quantum dots by using reversible regulatory color transformation.

It is known that polychromatic carbon quantum dots (CQDs) can be obtained by doping and surface modification. The layer-wise synthesis of blue and green emitting CQDs (with typical sizes between 3 and 6 nm) is described here by adding oxalic acid and by introducing polycarboxy groups. By changing the external environment, the emission of CQDs can be adjusted in the blue-green spectral region (469-527 nm) under photoexcitation at 405 nm. The findings presented here provide new directions for the reversibl...

Diindeno-fused Dibenzoa,hanthracene and Dibenzoc,lchrysene: Syntheses, Structural Analyses and Properties.

Diindeno-fused dibenzo[a,h]anthracene 6 and diindeno-fused dibenzo[c,l]chrysene 9 contain the key moieties 1,4-quinodi-propene (1,4-QDP) and 2,6-naphthoquinodipropene (2,6-NQDP), respectively, and they both have an open-shell singlet ground state. The latter compound exhibits a strong biradical character and interesting properties, including a low ΔETS (2.64 kcal/mol), a small HOMO-LUMO gap (1.06 eV), a wide photoabsorption range (250-1172 nm) and a large two-photon absorption cross-section (S = 1342 ± 56...

Phleomycin complex - Coordination mode and in vitro cleavage of DNA.

Phleomycin is one of the anticancer glycopeptide antibiotics which cause DNA cleavage. It is commonly used as a copper(II) complex. Therefore, it is important to study the metal ion binding process and to define the coordination mode. In this paper, we describe the acid-base properties of phleomycin and the coordination sphere of the Cu(II) cation. In the metal binding process up to five nitrogen donor atoms can be involved. Four of them in the same plane deriving from: the pyrimidine ring, secondary amine ...

Detection of Airway Invasion During Flexible Endoscopic Evaluations of Swallowing: Comparing Barium, Blue Dye, and Green Dye.

Purpose The aim of this study was to assess the effects of barium, blue dye, and green dye on the frequency and reliability of detecting airway invasion (penetration and aspiration) seen during flexible endoscopic evaluations of swallowing (FEES). Method Thirty patients with neurodegenerative disease and suspected dysphagia underwent an FEES. Patients were presented with 10-cc boluses of water colored with blue dye, green dye, and barium, within the same examination, in a randomized order. Airway protection...

Recent advances in ruthenium and platinum based supramolecular coordination complexes for antitumor therapy.

Since the discovery of cisplatin for antitumor activity, the platinum (Pt) based antitumor drugs have received significant attention and launched a new era to explore the transition metal complexes for therapy. However, these small Pt-based antitumor drugs have some limitations for their clinic application, such as short blood circulation time and limited accumulation at tumor site, which was mainly due to their poor water solubility and small molecule size. To overcome these obstacles, developing new gener...

Green Breast Milk Following Ingestion of Blue-Green Algae: A Case Report.

Breast milk is an excellent nutritional source for newborns, and a change in its color can be alarming to both mother and physician, and may prevent breastfeeding. Different colors of breast milk have been reported such as blood-stained, blue, and bluish-green. We present the first case of green breast milk caused by maternal ingestion of blue-green algae pills immediately before and after delivery. The score on the Naranjo Adverse Drug Reaction Probability Scale was 5, indicating a probable adverse drug re...

Regulating the Photophysical Property of Organic/Polymer Optical Agents for Promoted Cancer Phototheranostics.

On the basis of the Jablonski diagram, the photophysical properties of optical agents are highly associated with biomedical function and efficacy. Herein, the focus is on organic/polymer optical agents and the recent progress in the main strategies for regulating their photophysical properties to achieve superior cancer diagnosis/phototheranostics applications are highlighted. Both the approaches of nanoengineering and molecular design, which can lead to optimized effectiveness of required biomedical functi...

Strain-tunable electronic and optical properties of novel anisotropic Green phosphorene: a first-principles study.

The effect of in-layer strain on the optical and electrical properties of monolayer green phosphorene, a new anisotropic two-dimensional (2D) material, has been systematically studied. The studied strain includes in-layer uniaxial strain and biaxial strain. Green phosphorene can be viewed as a combination of black and blue phosphorene segments in regular order. We adopt the HSE06 method to correct the calculated results. The results reveal that, firstly, strain-free monolayer green phosphorene is a stable d...

Motor Coordination and Executive Functions as Early Predictors of Reading and Spelling Acquisition.

The role of motor coordination and executive functions in kindergarten for reading/spelling in 1st/2nd grade was examined in the light of other domain-general predictors. N = 173 children were included in the final analyses. A structural equation model with motor coordination, fluid intelligence, age and self-concept as predictors of reading/spelling fitted well. When EF were included, motor coordination and fluid intelligence were not associated with reading/spelling performance. A final model with EF, age...

Bridging the green gap: MOF hetero-multilayers assembled from porphyrinic linkers identified using computational screening.

In organic photovoltaics, porphyrins (PPs) are among the most promising compounds owing to their large absorption cross section, wide spectral range, and stability. Nevertheless, a precise adjustment of absorption band positions to reach a full coverage of the so-called green gap has not been achieved yet. We demonstrate that a tuning of the PP Q- and the Soret bands can be done using a computational approach where substitution patterns are optimized in silico. The Most promising candidate structures were t...

Computer-Aided Design of Luminescent Linear N-Heterocyclic Carbene Copper(I) Pyridine Complexes.

Multireference configuration interaction methods including spin-orbit interactions have been employed to investigate the photophysical properties of various linear N-heterocyclic carbene (NHC) copper(I) pyridine complexes with the aim of designing performant thermally activated delayed fluorescence (TADF) emitters for use in organic-light-emitting diodes. Our theoretical results indicate that this structural motif is very favorable for generating excited triplet states with high quantum yield. The first exc...

Photoinduced energy- and electron-transfer processes in a side-to-face RuII-porphyrin/perylene-bisimide array.

A side-to-face array DPy-gPBI[Ru(4-tBuTPP)(CO)]2, based on a "green" perylene bisimide chromophore sandwiched between two RuII-porphyrins, has been prepared by self-assembly. Its photophysical properties have been characterized in detail by a combination of steady-state and time-resolved techniques upon selective excitation of the two different components. Different photoinduced processes are observed as a function of the excitation wavelength. Electron transfer quenching is attained upon "red light" excita...

High local coordination symmetry around the spin center and the alignment between magnetic and symmetric axes together play a crucial role in single-molecule magnet performance.

A tetradentate 8-hydroxyquinoline-based acyl hydrazone ligand (HL1 = 8-hydroxyquinoline-2-carboxaldehyde-(aminourea)hydrochloride) was elaborately used to construct a mononuclear dysprosium complex DyCl3HL1·CH3OH (1) with a nearly ideal pentagonal bipyramid coordination geometry (D5h) surrounding the Dy(iii) ion to achieve the significant performance of single-molecule magnets (SMMs). Meanwhile, the isolated high local symmetry center was successfully kept intact and further bridged to a series of double b...


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