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…     

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.     

Structures and Photoluminescent Properties of 3D Ho(Ⅲ) and Y(Ⅲ) Complexes with 2,4,6-Pyridinetricarboxylate

Two 3D rare earth coordination polymers {[Ho(ptc)(H_2O)_(2.5)]·0.5 H_2O}n(1) and {[Y2(ptc)2(H_2O)_5]·H_2O}n(2)(H_3ptc = 2,4,6-pyridinetricarboxylic acid) have been synthesized with Ho(Ⅲ) or Y(Ⅲ) chloride and H_3ptc by hydrothermal method. The X-ray structure analyses display the two complexes are isomorphic and crystallize in monoclinic crystal system with P21/n space group for 1 and P21/c space group for 2. Ho(Ⅲ) and Y(Ⅲ) both show two different coordination modes. One is nine-coordinated and forms a distorted tricapped trigonal prism and the other is eight-coordinated to get a distorted bicapped trigonal prism. The ptc3-also shows two different coordination modes by connecting four or three rare earth ions. The photoluminescent properties of 2 show that it can emit blue fluorescence at 440 nm with excitation at 335 nm. The fluorescence lifetime of 2 is 1.64 μs and the absolute fluorescence quantum yield is 10.2%.     

Stability Constants and Fluorescence of Terbium(Ⅲ) Complexes with Polyaminopolycarboxylates in Aqueous Solution

ＩｎｔｒｏｄｕｃｔｉｏｎＡｖａｒｉｅｔｙｏｆｎｅｗｐｏｌｙａｍｉｎｏｐｏｌｙｃａｒｂｏｘｙｌａｔｅｌｉｇａｎｄｓａｎｄｔｈｅｉｒｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｓｙｎｔｈｅｓｉｚｅｄｉｎｒｅｃｅｎｔｙｅａｒｓｂｅｃａｕｓｅｏｆｔ...     

Syntheses and Magnetism of Binuclear Tb(Ⅲ)-Tb(Ⅲ)Complexes with Dianion of Chloranilic Acid as Bridging Ligand

The syntheses, spec(?) complexes are of significance for understanding mechanisms of magnetic interaction between metal ions and the exploitation of the synthesis of molecular magnetic materials. There were a few works reported previously on the syntheses and magnetic in-     

The Study on the Stability Constant and Species Distribution of Eu (III) and Tb (III) Complexes with BDBPH

Biomimetic hydrolysis of DNA or RNA is of increasing importance in biotechnology and medicine. The ability to cleave nucleic acids efficiently, in a non-degradative manner, and with high levels of selectivity for site or structure will be required by many applications for the manipulation of genes, the design of structural probes and the development of novel therapeutics1. There has been much interest in the development of lanthanide complexes as nucleic acid cleavage agents. It has been fou…     

The Study on the Stability Constant and Species Distribution of Eu （Ⅲ） and Tb （Ⅲ） Complexes with BDBPH

The stability constants and species distributions of complexes of two lanthanide ions, Eu（Ⅲ） and Tb（Ⅲ）, with a macrocyclic ligand, BDBPH, in 1：1 and 2：lsystem, were determined potentiometrically at 25.0 ℃ and I=0.100 mol L^-l. The two metal ions could form deprotonated mono- or dinuclear complexes with BDBPH after the first two protons of the ligand completely neutralized. At higher pH values, Eu（Ⅲ） could not form hydroxy complexes with BDBPH, while Tb（Ⅲ） could form hydroxy complexes in the type of M2L（OH）, M2L（OH）2, and M2L（OH）3.     

The Luminescence Properties and Intramolecular Energy Transfer of Rare Earth Complexes with Aromatic Carboxylic Acids

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｉｎｔｒａｍｏｌｅｃｕｌａｒｅｎｅｒｇｙｔｒａｎｓｆｅｒｐｒｏｃｅｓｓａｎｄｍｅｃｈａｎｉｓｍｏｆｒａｒｅｅａｒｔｈｃｏｍｐｌｅｘｅｓｗｉｔｈβ－ｄｉｋｅｔｏｎｅｓｈａｖｅｂｅｅｎｇｅｎｅｒａｌｙｓｔｕｄｉｅｄａｎｄａｃ...     

Effect of the Nature of the Polymer Matrix on the Luminescence of Tb(III) Complexes with β-Diketone Copolymers

The formation conditions and luminescence of Tb(III) complexes with synthesized copolymers of unsaturated acetylacetone derivatives with styrene and methyl methacrylate were studied. The luminescence intensity of these Tb(III) complexes was found to depend on the β-diketone substituent nature (CH₃, CF₃, C₆H₅) and structure (linear, branched) and the β-diketone to monomer ratio in the polymerizing mixture.     

Syntheses and Properties of Tripicolinatechromium (Ⅲ)

Chromium (Ⅲ) has been implicated as glucose tolerance factor (GTF) in the maintenance of normal lipid and carbohydrate metabolism^[1]. Several organic chromium (Ⅲ) complexes containing nicotinate, amino acids ligand which have much higher biological activity than chromic chloride have been synthesized and extensively studied^[2]. Tripicolinatechromium (Ⅲ) as a new human chromium(Ⅲ) nutritional supplement was shown to reduce the symptoms of diabetes, hyperglycemia and cholesterol significantly^[3]. Although the crystal structure and NMR spectrum of tripicolinatechromium (Ⅲ) was studied previously^[4,5], Its properties have only received little attention. In this paper, we report the studies of syntheses and properties of tripicolinatechromium(Ⅲ).     

Studies on the Coordination of Pr(Ⅲ) with Adrenaline by Potentiometry and Absorption Spectroscopy

AsanextensiontoourpreviousworkI'2,thecoordinati0n0fPr(III)withadrenaline(3,4-dihydroxy-a-(methylamin0methyl)baIcohol,(HO)=C,H,CH(OH)CH,NHCH,)hasbeeninvestigatedbypotentiometryandabsorptionspectroscopyinthepresentw0rk.PotentiometrictitrationswerecarriedoutonapHS-3CpHmeterunderbi0logicalconditions(37'Candanionicstrengthof0.l5m0l/LNaCl)byusingthetitrationtechniquesdescribedinprevi0uspapers3'4.TheabsorptionspectraofPr(lII)-adrenalinesystemwererec0rdedinvisibleregi0natvariouspHvalueswit…     

Ab initio Study on the Interaction of La (Ⅲ) with Adrenaline

IntroductionInrecentyears,thebiologlcaIeffectsofrareearthshavcbeendsdsedestensiveyinChina.IthasbecnfoundthatrareearthsshowintcreedngneuralandendocrineeffeCtlll.Thermdyontheintcractionofrareearth8withhormoncisveryhoportanttoclariopgthencuralandendocrinceffecofrareearth8anditsmeckanism.Adrenalineisavitalkindofhormone.ThermdiesoncomplexesofmstaiionswithadrenalinhavebecnrePOrted12'4l.Bowever,whichgroupofadrenalinescrvesasdonorhasbeenund6rcoatmersyforalongtimc.Thus,theinteractionofLa(III)witba…     

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.     

Stability Constants and Spectroscopic Properties of Thorium(IV)–Arsenazo III Complexes in Aqueous Hydrochloric Medium

The complexation characteristics of thorium–arsenazo III in the range of 1–6 mol·L^?1 hydrochloric acid media were investigated by UV–Vis absorption spectroscopy and computational analysis. The chemical equilibrium model of thorium–arsenazo III complexation was established including the species distribution of arsenazo III, the formation of thorium chloride species, and the release of protons from thorium–arsenazo III complexes. In the spectra of thorium–arsenazo III complexes, two characteristic absorption peaks were observed at 610 and 660 nm, and the latter peak showed a tendency to shift about 4 nm to higher wavelength as the acidity of the hydrochloric acid media increased from 1 to 6 mol·L^?1. Analysis of the experimental data indicates that the molar absorptivities of both 1:1 and 1:2 complexes (thorium to arsenazo III) steadily increase as the acidity of medium increases. The determined stability constants of 1:1 and 1:2 complexes at various concentrations of hydrochloric acid were extrapolated to zero ionic strength, based on the specific ion interaction theory (SIT) approach. The limiting stability constants were determined to be \( { \log }_{10} \beta_{11}^{\text{o}} \) = 8.56 ± 0.13 and \( {\log}_{10} \beta_{12}^{\text{o}} \) = 15.17 ± 0.18 with ion interaction coefficients of Δε ₁₁ = –0.57 ± 0.02 kg·mol^?1 and Δε ₁₂ = –0.60 ± 0.04 kg·mol^?1, respectively.     

Synthesis,Crystal Structure,and Fluorescent and Thermal Stability Properties of Two New Cobalt(Ⅱ) Complexes with 2,2'-Bipy as Ligand

Two new cobalt(Ⅱ)complexes[Co_2(2,2?-bipy)_2(dpa)_2(H_2O)_5]·4H_2O(1)and Co(2,2?-bipy)_3(SO_4)]·7.5H_2O(2)have been synthesized with diaphonic acid(H_2dpa)and 2,2?-bipyridine(2,2?-bipy)as ligands.In 1,two neighboring cobalt(Ⅱ)ions are linked together by one bridging diaphonic acid group,forming an asymmetric dinuclear structure.1 crystallizes in triclinic,space group ■ with a=9.825(6),b=13.007(8),c=19.586(1)?,α=80.773(1)o,β=77.065(1)o,γ=85.902(1)o,M_r=431.4,V=2406.5(3)?~3,D_c=1.48 g/cm~3,Z=2,μ(Mo Kα)=0.767 mm~(-1),F(000)=1112,the final R=0.0379 and wR=0.0862.The central cobalt(Ⅱ)ions in 1 and 2 are coordinated with six atoms,forming distorted octahedral coordination geometry.The fluorescence and thermal stability properties of 1 and 2 are also reported.     

Synthesis, Structure and Magnetic Properties of Novel Carboxylato-bridged Pentanuclear Copper(Ⅱ)-Lanthanoid(Ⅲ) Complexes

ＩｎｔｒｏｄｕｃｔｉｏｎＰｏｌｙｎｕｃｌｅａｒｍｉｘｅｄ－ｍｅｔａｌｃｏｍｐｌｅｘｅｓｃｏｎｔａｉｎｉｎｇｂｏｔｈｔｒａｎｓｉｔｉｏｎａｎｄｌａｎｔｈａｎｏｉｄｍｅｔａｌｉｏｎｓａｒｅｏｆｓｐｅｃｉａｌｃｕｒｅｎｔｉｎｔｅｒｅｓｔｉｎｒｅｌａｔｉｏｎ...     

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.)     

Carboxylate-induced Various Structures of Ni(II) Complexes with Fluorescence Sensing and Bifunctional Electrochemical Properties

We synthesized three new Ni(II) coordination polymers [Ni(LXHLPXH2O)2]- H2O(CP1),[Ni(LXNIP)]-2H2O(CP2) and [Ni(LXNDCXH20)2](CP3)[L=N,N′-bis(pyridme-3-yl)thiophene-2,5-dicarboxamide, H2HIP=5-hydroxyisophthalic acid, H2NIP=5-nitroisophthalic acid, H2NDC=2,6-naphthalenedicarboxylie acid] by hydrothermal method, which were characterized by means of infrared spectra(IR), TG analyses, PXRD and single-crystal X-ray diffraction. The CPI is a ID tubular structure based on [Ni-HIP]2 loops and pairs of L ligands. CP2 is a 2D 3,5-connected architecture, which consists of Ni-L linear chains and (Ni-NIP)2 double chains. CP3 is a 2D network, which features 4-connected topology. Solid-state luminescent behaviours of CP-P3 were investigated. The CPI can detect Fe^3+ ions through luminescence quenching. The electrochemical properties of CPI buk-modified carbon paste electrode(CP1-CPE) has also been investigated, which has bifunctional electrocatalytic activity for oxidation of ascorbic acid and reduction of NO2^-.