Luminescent Properties of Terbium（Ⅲ） and Europium（Ⅲ）Complexes with Six 4-Acetyl-bispyrazolones

The lowest triplet energy levels of the six ligands（T） were determined to be 22989 cm-1[1,3-bis-（1＇-phenyl-3＇-methyl-5＇-pyrazolon-4＇）-1,3-propanedione,BPMPTD],23148 cm-1[1,4-bis-（1＇-phenyl-3＇-methyl-5＇-pyrazolon-4＇）-1,4-butanedione,BPMPBD],23419 cm-1[1,5-bis-（1＇-phenyl-3＇-methyl-5＇-pyrazolon-4＇）-1,5-pentane-dione,BPMPPD],23310 cm-1[1,6-bis-（1＇-phenyl-3＇-methyl-5＇-pyrazolon-4＇）-1,6-hexanedione,BPMPHD],21978 cm-1[1,9-bis-（1＇-phenyl-3＇-methyl-5＇-pyrazolon-4＇）-l,9-nonanedione,BPMPND] and 21930 cm-1[1,10-bis-（1＇-phenyl-3＇-methyl-5＇-pyrazoion-4＇）-1,10-decanedione,BPMPDD],respectively.It was explained satisfactorily that the six ligands are more efficient for sensitizing the luminescence of Tb3＋ than that of Eu3＋ at room temperature,and the order of the luminescent intensities for the Tb3＋ complexes is explained by the relative energy gap between T and 5DJ of Tb3＋ or Eu3＋.As a conclusion,when 2700 cm-1＜△E（T-5D4）＜3000 cm-1,the luminescent intensity of the Tb3＋ complex is the strongest.This means that the lowest triplet energy level of the ligand is a chief factor to dominate RE3＋luminescence.     

Synthesis and Luminescence Study of Europium Complexes with Carboxylic Acid and 1,10-Phenanthroline Ligands

A series of euroPium(Ⅱ)eomPlexes with earboxylie aeids andl,10-Phenantl飞ro-line:Eu(L):·pllen·jHoO,wl:ereL-formate,3-hydroxy-4-metlloxybenzoate,4一metl、oxybenzoate,4一ehloroPhenoxyaeetate,and diPI、enylaeetate,were synthesizedand el、araeterized by elemental analysis,UV sPeetrum,IR speetrum and melting point.IR da亡a eonfirmed tllat euroPium 15 eoordinated wirh 0 donor atoms in earboxy!ie aeidand N donor atoms inl,10一phenanthroline.A strong ligand一loealized absorption at270 nm!ed to a series of meta!一eentered emission bands between 580 and 710 nm as-signedto ~5D_0-7F_(0.1.2.3.)     

Stability and Luminescence Properties of Tb (Ⅲ) Complexes with Adrenaline

Theinteractionofrareearthwithhormoneshouldbestudiedindetailinordertoexploremechanismoftheneuralandendocrineeffectofrareearth.Asacontinuationofourresearchontheinteractionofrareeafthwithhormone',stabilityandluminescencepropertiesofTb(lII)complexeswithadrenalineorepinephrine(3,4-dihydroxy-a(methylaminomethyl)benzylalcohol,(HO)zCeH3CH(OH)CH=NHCHshavebeenstudiedinthiswork.Satisfactoryresultshavebeenobtained.PotentiometrictitrationsweremadeonapHS-3CpHmeterbymeansofthemethoddescribedinpreviou…     

Spectral Properties of Extracted Complexes of MetalPicrates with Crown Ethers

The investigation on UV-visible spectra of species formed by extracting some metal picrates with benzo-15-crown-5(B15C5) and dibenzo-18-crown-6(DB18C6) verified that there are some interactions of picrate anion with K , Na and rare earth ions in loaded organic phase. By the study of the charge transfer band and absorption spectra of picrate anion, it can be determined whether an ion pair has been formed and either a 1 : 1 contact ion pair or a 1 : 2 crown-separated ion pair involved in organic phase can be distinguished for an ion-pair extraction.     

Synthesis and Antimicrobial Properties of the Novel Fluorinated Bis-ammonium Salts with Two Primary Amine Groups

In order to resolve the increasing resistance phenomena of the Gram-negative bacteria against single chain quaternary ammonium salts （QAS）, lysine with a pedant fluorinated bis-ammonium salts was synthesized and its antimicrobial properties were evaluated in this work. The novel fluorinated bis-ammonium salts shows similar activity with conventional single chain quaternary ammonium salts against Gram-positive bacteria but stronger activity against Gram-negative bacteria and yeast compared with the single chained counterpart.     

Synthesis of New Ruthenium（Ⅱ）Bipyridyl Complexes and Studies on Their Photophysical and Photoelectrochemical Properties

Two new mixed-ligand ruthenium(Ⅱ） complexes,Ru(dcbpy)-(LL)NCS)2[where dcbpy=4,4‘-dicarboxyl-2,2‘‘-bipyridine,LL=4,4‘-bis(N-methyl-anilinomethyl)-2,2‘‘-bipyridine(2)],were synthesized,and the tphotophysical properties of these complexes were studied.The metal-to-ligand charge transfer (MLCT) transitions of these complexes exhibited solvatochromic effect due to the existence of NCS ligands.The MLCT energies also strongly depend on the pH values of the solutions because of protonation and deprotonation of the carboxyl groups.The pKa values of the ground state,4.0 for 1 and 3.8 for 2,were obtained from the titration curves.The photoelectrochemical properties of 1 and 2 as sensitizers in sandwich-type solar cells have been studied.Complex 1 exhibited better photoelectrochemical behavior than complex 2 as expected.It was proved that the design of mixed-ligand complex by introducing electron donating group in one of the ligands should be a promising approach.     

Synthesis of New Ruthenium(II) Bipyridyl Complexes and Studies on Their Photophysical and Photoelectrochemical Properties

IntroductionDye sensitizedsolarcells (DSSC)havebecomethefocusofmanyinvestigationssinceMichaelGr tzelandco workersmadethedyemoleculesadsorbedonaporousnet workoftheinterconnectednanometer sizedcrystallinesofawidebandgapsemiconductor.1 3Animpressivesolar to electricalenergyconversionefficiencyof 10 %hasbeenre portedanditmakespracticalapplicationfeasible .4 Thissystemconsistsofadye coatedsemiconductorelectrodeandacounterelectrodearrangedinasandwichconfigura tionandtheinter electrodespaceisfilled…     

Red Mechanoluminescence and Photoluminescence from Novel Europium Complexes

IntroductionMechanoluminescence(ML)islightemissioncausedbymechanicalforcesuchasgrinding,cuttingandsoon.AlthoughsomeofinorganicandorganicmolecularsolidsshowML,theMLmechanismhasnotbeenclearlyelucidatedyetl-4.The'compound,whichshowsallofML,photoluminescence(PL)andelectroluminescence(EL)properties,hasneverbeenreported.Recently,organiceuropium-compIexeshaveattractedsignificantinterestforthedevelopmentofELdevices5-'.ItisconsideredthateuropiumcomplexesareoneofthebestredELmaterialsduetotheirgo…     

Reaction of 2-chloromethylbenzimidazoles with acetylacetone and benzoylacetone. Basic breakdown ofβ-diketones

Base treatment of the products of alkylation of-diketones by 2-chloromethylbenzimidazole under phase transfer catalysis (PTC) conditions causes loss of the acetyl group and formation of methylethyl- or ethylphenyl ketones.Rostov State University, Rostov-on Don 344090. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1067–1071, August, 1996. Original article submitted March 25, 1996.     

Synthesis of Eu(III) and Tb(III) Complexes with Two New Amide Type Podands and Their Luminescence Properties

ＩｎｔｒｏｄｕｃｔｉｏｎＬａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｈａｖｅａｔｔｒａｃｔｅｄｍｕｃｈａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｔｈｅｉｒｉｍｐｏｒｔａｎｔａｐｐｌｉｃａｔｉｏｎｓ .1ＩｎｐａｒｔｉｃｕｌａｒＥｕ(ＩＩＩ)ａｎｄＴｂ(ＩＩＩ)ｃａｎｂｅｃｈａｒａｃｔｅｒｉｚｅｄｂｙｌｏｎｇ ｌｉｖｅｄ(ｍｓｔｉｍｅｓｃａｌｅ)ａｎｄｓｔｒｏｎｇｌｕｍｉｎｅｓｃｅｎｔｅｌｅｃｔｒｏｎｉｃａｌｌｙｅｘ ｃｉｔｅｄｓｔａｔｅｓ ,ｗｈｉｃｈｍａｋｅｓｔｈｅｍｉｍｐｏｒｔａｎｔｉｎａｎａｌｙｔｉｃａｌｃｈｅｍ…     

The Emergence and Properties of Selectively Fluorinated ‘Janus’ Cyclohexanes

This account describes the evolution of a research programme that started by linking fluoromethylene (−CHF−) groups along aliphatic chains and then progressing to alicyclic rings with contiguous fluorine atoms. Different stereoisomers of aliphatic chains tend to adopt low polarity conformations. In order to force polar conformations, the programme began to address ring systems and in particular cyclohexanes, to restrain conformational freedom and co-aligned C−F bonds. The flagship molecule, all-cis-1,2,3,4,5,6-hexafluorocyclohexane 7 , emerged to be the most polar aliphatic compound recorded. The polarity arises because there are three co-aligned triaxial C−F bonds and the six fluorines occupy one face of the ring. Conversely the electropositive hydrogens occupy the other face. These have been termed Janus face cyclohexanes after the Roman god with two faces. The review outlines progress by our group and others in preparing derivatives of the parent cyclohexane 7 , in order to explore properties and potential applications of these Janus cyclohexanes.     

Synthesis of Eu（Ⅲ） and Tb（Ⅲ） Complexes with Two New Amide Type Podands and Their Luminescence Properties

Two new amide type podands L1 and L2 (L1=1,1,1-tris{[2-benzylaminoformyl)phenoxyl] methyl} propane,L2=1,3,5-timethyl-2,4,6-tris{[2-benzylaminoformyl)phenoxyl]methyl} benzene)and their europium and terbium nitrates complexes were synthesized.The luminescence properties of these complexes were also studied.     

Silica-supported Polysiloxanes with Dithiacrown Ether Groups and Their Platinum Complexes

The present paper represents the syntheses of polypropyloxymethyldithia 15-crown-5 and 18-crown-6 supported on silica and their platinum complexes. The platinum complexes are effective catalysts for the hydrosilylation of olefins with triethoxysilane. The influences of temperature, amount of platinum complexes used and the nature of olefins used on the catalytic activity of the complexes are also investigated in this paper.     

Heat Capacities and Thermodynamic Properties of Lanthanum/Holmium Perchlorate Complexes with Glycine

IntroductionSinceAnghilerietal.1reportedin 1975thatthecom plexoflanthanumchloridewithglycinehadanti canceref fect,complexesofrareearthwithaminoacidhavebeenex tensivelystudied .Inthepastdecades,about 2 0 0kindsofcomplexesofrare earthcompoundswithaminoacidshavebeensynthesizedandstudied .2 Theycanbeusedasantisepticandanticancerdrugsinmedicine,additivesofanimalforageandfertilizerinagriculture,andwooldyeintextileindus try .3,4 Complexesofrareearthwithaminoacidwerewidelyusedinmanyfields,however,the…     

Synthesis, Crystal Structure and Properties of a Europium Complex with 3-Iodobenzoic Acid and 2,2'-Bipyridine

The complex [Eu(3-IBA)3·2,2'-bipy]2 was synthesized from 3-iodobenzoic acid (3-HIBA), 2,2'-bipyridine (2,2'-bipy) and EuCl3·6H2O by hydrothermal synthesis, and its crystal structure was determined by X-ray single-crystal diffraction. It is of triclinic, space group P1, with a = 10.958(2), b = 12.311(3), c = 12.556(3) A, α = 81.549(3), β = 82.404(4), γ = 78.348(3)°, Mr = 1049.15, V = 1631.7(6) 3, Z = 1, Dc = 2.135 g/cm3, F(000) = 980, λ(MoKα) = 0.71073 , μ(MoKα) = 4.804 mm-1, the final R = 0.0329 and wR = 0.0723 for 4640 observed reflections with I > 2σ(I). The Eu(Ⅲ) ion is eight-coordinated and two Eu(Ⅲ) ions are held together by four 3-iodobenzoate groups in the bidentate bridging mode. The complex was characterized by DTA-TG, IR, UV and fluorescence spectra.     

Heat Capactites and Thermodynamic Properties of Lanthanum／Holmium Perchlorate Complexes with Glycine

The heat capacities of the two complexes, [La₂(Gly)₆(H₂O)₄]‐(ClO₄)₆ and [Ho₂(Gly)₄(H₂O)₄](ClO₄)₆·2H₂O (Gly = glycine), were measured by adiabatic calorimetry in the temperature range from 78 to 375 K. A solid‐solid phase transition was found between 322.87 and 342.29 K for [Ho₂(Gly)₆(H₂O)₄](ClO₄)₆·2H₂O, and the peak temperature, the enthalpy and the entropy of the transition were obtained to be 330.94 K, 11.65 kJ·mol^?1 and 35.20 J· K^?1·mol^?1, respectively. No indication of any phase transition or thermal anomaly was observed for [La₂ (Gly)₆ (H₂O)₄ ] (ClO₄)₆. Thermal stabilities of the two complexes were investigated by thermogravimetry in the temperature range of 40–800°C. The possible mechanisms for the thermal decompositions were proposed according to the TG and DTG curves.     

Interactions of γ-Cyclodextrin with the Mixed Micelles of Anionic Surfactants and Their Inclusion Complexes Formation

Interactions of γ-cyclodextrin (γ-CD) with the single and mixed micelles of sodium dodecyl sulfate (SDS) and sodium lauroyl sarcosine (SLAS) have been studied at different concentrations of γ-CD by using conductivity measurements. From conductivity data, the pure and mixed critical micellar concentration (cmc), the equivalent ionic conductivities of the monomeric species (Λ _m), the associated species (Λ _assc) and the micelle (Λ _mic), the degree of counterion dissociation (χ) in the presence of γ-CD have been evaluated from the slope of the conductivity versus concentration plots for the pure and binary mixture of surfactants. From the dependence of cmc of the surfactantson γ-CD concentration, we have deduced the association constant (K) of surfactant-γ-CD inclusion complexes assuming 2:1 stoichiometry. Theories of Clint, regular solution, and Motomura's have been used for the evaluation of ideality or nonideality of the mixed system. Mixed micelles were found to be rich in SDS content in the presence and the absence of γ-CD. The cmc values have been used to evaluate the transfer of standard free energy of micelles (ΔG⁰ _M,tr) from the aqueous medium to additive medium.     

Synthesis and Characterization of Novel Orange-emitting Iridium(III) Complexes with Diphenylquinoline Ligands Containing Fluorinated Substituent

Recently, the iridium complexes as phosphorescent emitter in organic light-emitting diodes (OLEDs) have attracted much attention since the realization of a high efficiency OLED device based on the complex fac tris(2-phenylpyridine)iridium [Ir(ppy)3]1-4. T…     

Synthesis, Crystal Structure and Properties of a Europium Complex with 3-Iodobenzoic Acid and 2,2＇-Bipyridine

The complex [Eu（3-IBA）3·2,2＇-bipy]2 was synthesized from 3-iodobenzoic acid （3-HIBA）, 2,2＇-bipyridine （2,2‘-bipy） and EuCl3·6H2O by hydrothermal synthesis, and its crystal structure was determined by X-ray single-crystal diffraction. It is of triclinic, space group Pi, with a = 10.958（2）, b = 12.311（3）, c = 12.556（3） A, α = 81.549（3）, β = 82.404（4）, γ = 78.348（3）°, Mr = 1049.15, V= 1631.7（6） A3, Z = 1, Dc = 2.135 g/cm^3, F（000） = 980, 2（MoKa） = 0.71073 A,μ（MoKa） = 4.804 mm^-1, the final R = 0.0329 and wR = 0.0723 for 4640 observed reflections with I 〉 2σ（I）. The Eu（Ⅲ） ion is eight-coordinated and two Eu（Ⅲ） ions are held together by four 3-iodobenzoate groups in the bidentate bridging mode. The complex was characterized by DTA-TG, IR, UV and fluorescence spectra.