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1.
Dehaen G Verwilst P Eliseeva SV Laurent S Vander Elst L Muller RN De Borggraeve WM Binnemans K Parac-Vogt TN 《Inorganic chemistry》2011,50(20):10005-10014
Trinuclear heterobimetallic Ln(III)-Ru(II) complexes (Ln = Eu, Gd) based on a 1,10-phenanthroline ligand bearing a diethylenetriaminepentaacetic acid (DTPA) core have been synthesized and fully characterized by a range of experimental techniques. The (17)O NMR and proton nuclear magnetic relaxation dispersion (NMRD) measurements of Gd(III)-Ru(II) show that, in comparison to the parent Gd-DTPA, this complex exhibits improved relaxivity, which is the result of an increase of the rotational correlation time. Relaxometry and ultrafiltration experiments indicate that the 1,10-phenanthroline ligand has a high affinity for noncovalent binding to human serum albumin, which results in a high relaxivity r(1) of 14.3 s(-1) mM(-1) at 20 MHz and 37 °C. Furthermore, the Ln(III)-Ru(II) complexes (Ln = Eu, Gd) show an intense light absorption in the visible spectral region due to metal-to-ligand charge transfer (MLCT) transitions. Upon excitation into the MLCT band at 440 nm, the complexes exhibit a bright-red luminescence centered at 610 nm, with a quantum yield of 4.7%. The luminescence lifetime equals 540 ns and is therefore long enough to exceed the fluorescent background. Monometallic lanthanide complexes have also been synthesized, and the Eu(III) analogue shows a characteristic red luminescence with a quantum yield of 0.8%. Taking into account the relaxometric and luminescent properties, the developed Gd(III)-Ru(II) complex can be considered as a potential in vitro bimodal imaging agent. 相似文献
2.
A. Yu. Tolbin M. O. Breusova V. E. Pushkarev L. G. Tomilova 《Russian Chemical Bulletin》2005,54(9):2083-2086
New boron μ-chloro-and μ-alkoxyhexabutylsubphthalocyanines were synthesized. A heteronuclear complex containing both the phthalocyanine
and subphthalocyanine fragments was prepared. The spectroscopic properties of these compounds were studied.
Dedicated to Academician N. S. Zefirov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2020–2023, September, 2005. 相似文献
3.
Single molecule and single atom sensors for atomic resolution imaging of chemically complex surfaces
Kichin G Weiss C Wagner C Tautz FS Temirov R 《Journal of the American Chemical Society》2011,133(42):16847-16851
Individual Xe atoms as well as single CO and CH(4) molecules adsorbed at the tip apex of a scanning tunneling microscope (STM) function as microscopic force sensors that change the tunneling current in response to the forces acting from the surface. An STM equipped with any of these sensors is able to image the short-range Pauli repulsion and thus resolve the inner structure of large organic adsorbate molecules. Differences in the performance of the three studied sensors suggest that the sensor functionality can be tailored by tuning the interaction between the sensor particle and the STM tip. 相似文献
4.
The title compound has been synthesized as the first oligothiophenophane that has the typical stacking structure of a layered cyclophane and can behave as an ideal pi-dimer model. 相似文献
5.
In this paper, we present a synthetic approach to the first hexapyrenylbenzene starting from 4,5,9,10-tetrahydropyrene. Absorption and fluorescence spectroscopic measurements show strong and red-shifted fluorescence both from locally excited pyrene states and from the excitonic manifold of the aggregate. [structure: see text] 相似文献
6.
Xuebin Wang 《Journal of Radioanalytical and Nuclear Chemistry》2001,249(3):523-525
In this study, the preparation of the 99m TcN complex of DMSA (dimercaptosuccinicacid) was carried out as a freeze-dried formulation, through a simple procedureinvolving the initial of 99m TcO 4 – with succinic dihydrazide in thepresence of stannous chloride as reducing agent, followed by the additionof the ligand DMSA to afford the final product. The radiochemical purity ofthe 99m TcN-DMSA complex was over 90% determined by thin layer chromatography.It was stable over 8 hours at room temperature. Its partition coefficientindicated that it was a good hydrophilic complex. Biodistribution in miceshowed that the 99m TcN-DMSA complex was accumulated in bone with high uptakeand good retention, suggesting it would be potentially useful as a bone imagingagent containing the [ 99m TcN] 2+ core. The biodistribution comparison inmice of the 99m TcN-DMSA complex and the 99m Tc-DMSA complex indicate thatthe presence of the 99m Tc nitrido group significantly alters the biologicalproperties of the 99m Tc complex. 相似文献
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The complex [Ru(II)(dcbpyH2)(bdmpp)NCS](PF6) (1) (where dcbpyH2 is 2,2′-bipyridine-4,4′-dicarboxylic acid, bdmpp is 2,6-bis(3,5-dimethyl-N-pyrazoyl)pyridine,) is synthesized and characterized extensively by 1H NMR and 13C NMR 1D and 2D, mass spectroscopy, cyclic voltammetry, electronic absorption spectroscopy and IR. The half-wave potential of the Ru(II)/Ru(III) redox couple was measured at E1/2=+0.795 V versus Ag/AgCl in CH3CN. The complex presents three intense metal-to-ligand charge transfer (MLCT) (dM→πL*) absorption bands centered at 383 (=21 300 M−1 cm−1), 432 (=22 400 M−1 cm−1) and 475 nm (=23 400 M−1 cm−1), respectively. The absorbance is extremely strong between 400 and 500 nm and even at 620 nm, the extinction coefficient is still high (=3768 M−1 cm−1). The strong π-acceptor property of the trans-isothiocyanate ligand compared with the Cl− ligand is probably the cause of the blue-shift observed in complex 1. These properties make the complex potentially promising for the photosensitization process. The incorporation of TiO2 photoelectrodes derivatized with this complex into a solar cell using a composite polymer/inorganic oxide solid-state electrolyte confirmed its sensitizing ability. Incident monochromatic photon-to-current conversion efficiency (IPCE) values of about 30% and overall energy conversion efficiency (η) of 1.7% were obtained. 相似文献
9.
A 11 complex of Pd(II) with alizarin complexone was synthesized and characterized. This complex displays high catalytic activity in the hydrogenation of nitrobenzene and 1-hexene.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 741–743, March, 1991. 相似文献
10.
Angeles De La Cruz Jose Elguero Pilar Goya Ana Martinez 《Journal of heterocyclic chemistry》1988,25(1):225-229
Fourteen N-azolylpropanamides have been prepared by Michael addition of azoles on acrylamide. The compounds have been fully characterized by IR and by 1H and 13C-nmr. The isolated compounds are the most stable derivatives; kinetic compounds were observed but could not be isolated. 相似文献
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Schulz S Spielmann J Bläser D Wölper C 《Chemical communications (Cambridge, England)》2011,47(9):2676-2678
OH/R (R = H, Me, i-Bu) exchange was observed in reactions of [MesnacnacZn(μ-OH)](2) (1) with metal complexes L(n)MR, whereas DippnacnacAl(Me)OH reacts with MesnacnacZnH with elimination of H(2) and formation of the heterobimetallic Al-Zn-oxide complex MesnacnacZnOAl(Me)Dippnacnac 2. 相似文献
13.
Pasatoiu TD Etienne M Madalan AM Andruh M Sessoli R 《Dalton transactions (Cambridge, England : 2003)》2010,39(20):4802-4808
A tetranuclear complex and a 1-D coordination polymer with a ladder-like topology have been obtained by connecting [Ni(II)Dy(III)] nodes with dicarboxylato ligands: [Ni?(valpn)?Dy?(III)(pdca)?(NO?)(H?O)?](NO?)·4H?O 1, and (∞)1[Ni?(H?O)?(valpn)?Dy?(tfa)?]·4CH?CN 2 (valpn2? = the dianion of the Schiff base resulting from reacting o-vanillin with 1,3-propanediamine; pdca2? = the dianion of 2,6-pyridinedicarboxylic acid; tfa2? = the dianion of the terephthalic acid). The magnetic measurements show a ferromagnetic interaction between Ni(II) and Dy(III), and that both compounds behave like SMM with strong tunnelling. The barrier of 2 (17.4 K) is higher than that of 1 (13.6 K). 相似文献
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Srinivasan Radhika Mookandi Kanthimathi Ramakrishnan Parthasarathi Balachandran Unni Nair 《Transition Metal Chemistry》2007,32(3):362-366
A new europium complex containing the chelate tridentate ligand and imidazole terpyridine (itpy), was synthesized. The complex
was characterized by elemental analysis, mass, FT-IR and photoluminescence spectroscopic techniques. The europium complex
in solution showed characteristic luminescence properties. The room temperature photoluminescence spectrum of this complex
was composed of typical Eu3+ red emission assigned to 5D0 → 7F2 transition. The metal-centered red emission seemed to be promoted by the ligand-assisted energy transfer, namely antenna
effect. 相似文献
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Li X Liu Y Luo J Zhang Z Shi D Chen Q Wang Y He J Li J Lei G Zhu W 《Dalton transactions (Cambridge, England : 2003)》2012,41(10):2972-2978
To tune aggregation/excimer emission and obtain a single active emitter for white polymer light-emitting devices (PLEDs), a heterobimetallic Pt(II)-Ir(III) complex of FIr(pic)-C(6)DBC(6)-(pic)PtF was designed and synthesized, in which C(6)DBC(6) is a di(phenyloxyhexyloxy) bridging group, FIr(pic) is an iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C(2)'] (picolinate) chromophore and FPt(pic) is a platinum(II) [(4,6-difluorophenyl)pyridinato-N,C(2)'] (picolinate) chromophore. Its physical and opto-electronic properties were investigated. Interestingly, the excimer emission was efficiently controlled by this heterobimetallic Pt(II)-Ir(III) complex compared to the PL profile of the mononuclear FPt(pic) complex in the solid state. Near-white emissions were obtained in the single emissive layer (SEL) PLEDs using this heterobimetallic Pt(II)-Ir(III) complex as a single dopant and poly(vinylcarbazole) as a host matrix at dopant concentrations from 0.5 wt% to 2 wt%. This work indicates that incorporating a non-planar iridium(III) complex into the planar platinum(II) complex can control aggregation/excimer emissions and a single phosphorescent emitter can be obtained to exhibit white emission in SEL devices. 相似文献
18.
Agnieszka Pazik Anna Skwierawska 《Journal of inclusion phenomena and macrocyclic chemistry》2013,77(1-4):83-94
Syntheses of N,N′-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described. The complexing properties of these compounds towards metal cations (Fe2+, Cu2+, Zn2+, Co2+, Ni2+) were investigated by absorption and infrared spectroscopy. The UV–Vis titrations were performed to estimate the stability constant values of the respective complexes with Cu2+ ion. Changes in UV–Vis absorption spectra and IR spectra of compound 6 under various concentrations of Cu2+ ion in methanol suggest formation of very unstable complex. The structure of ligand 2 has been deduced by X-ray crystallography. 相似文献
19.
Tanaka D Inose T Tanaka H Lee S Ishikawa N Ogawa T 《Chemical communications (Cambridge, England)》2012,48(63):7796-7798
A tetraphenylporphyrin based Tb(III) double-decker complex has been synthesized and the crystal structure of both protonated and deprotonated forms has been determined. The ac magnetic susceptibility measurements revealed that the SMM properties of the double-decker complex can be reversibly switched by only a single proton. 相似文献
20.
Martínez-Lillo J Armentano D De Munno G Lloret F Julve M Faus J 《Dalton transactions (Cambridge, England : 2003)》2011,40(18):4818-4820
The Re(IV)-Mo(VI) compound of formula (PPh(4))(2)[ReCl(4)(μ-ox)MoO(2)Cl(2)] (1) constitutes the first example of a heterodinuclear oxalato-bridged complex in the coordination chemistry of molybdenum. 相似文献