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101.
Andreas Wirth Ilona Lange Dagmar Henschel Oliver Moers Armand Blaschette Peter G. Jones 《无机化学与普通化学杂志》1998,624(8):1308-1318
Polysulfonylamines. CII. New Coordination Compounds Derived from Triorganyltin(IV) Dimesylamides and Uncharged Ligands: Mononuclear and Polynuclear Complexes with Molecular or Ionic Crystal Structures The purpose of this report is to draw attention to the remarkable versatility of the dimesylamides R3SnA [A– = (MeSO2)2N–; R = Me ( 1 a ) or Ph ( 1 b )] as precursors for pentacoordinate triorganyltin(IV) complexes belonging to four distinct structural types. Representative complexes were prepared by treating 1 a or 1 b in the appropriate molar ratios with unidentate thiourea or urea-type ligands or with the bidentate ligand [Ph2P(O)CH2]2 (DPPOE). The following compounds were characterized by X-ray analysis: [Me3Sn(A)(thiourea)] ( 2 a ; monoclinic, space group P21/n), [Ph3Sn(A)(tetramethylthiourea)] ( 2 b ; monoclinic, P21, two independent formula units), [Me3Sn(1-methylurea)2]+ · A– ( 3 a ; monoclinic, P21/c), [Ph3Sn(1,1-dimethylurea)2]+ · A– ( 3 c ; triclinic, P1), [{Ph3Sn(A)}2(μ-dppoe)] ( 4 ; triclinic, P1), [Ph3Sn(μ-dppoe)]nn+ · n A– · n MeCN ( 5 ; monoclinic, P21/c). The lattices of 2 a , 2 b and 4 contain discrete uncharged formula units which are mononuclear for 2 a and 2 b or dinuclear for 4 , whereas 3 a , 3 c and 5 have ionic structures featuring mononuclear cations for 3 a and 3 c or an infinite linear-polymeric cation for 5 . In all the structures, the tin atoms adopt trigonal-bipyramidal geometries, the apical positions being occupied in 2 a and 2 b by the S atom of the thiourea and one O atom of A–, in 3 a and 3 c by the O atoms of two urea-type ligands, in 4 by an O atom of the bridging DPPOE molecule and one O atom of A–, and in 5 by two phosphoryl O atoms from different bridging DPPOE ligands. In the structures of 2 a , 3 a and 3 c , the (thio)urea NH functions are connected to A– via intermolecular or interionic N–H … O and N–H … N hydrogen bonds. Crystals of [{Me3Sn(bipyH+ … A–)}2(μ-bipy)]2+ · 2 A– ( 6 ; monoclinic, C2/c) formed adventitiously in a reaction mixture containing 1 a and 4,4′-bipyridine. The rod-like supramolecular cation of 6 (length ca. 4 nm) is built up from two Me3Sn+ units bridged through bipy and unidentally coordinated by a monoprotonated bipy (= bipyH+), resulting in a trigonal-bipyramidal geometry around tin (N atoms apical); each of the terminal bipyH+ ligands forms an +N–H … N– hydrogen bond with one A–. 相似文献
102.
Nourhne Chouchne Amani Toumi Sarra Boudriga Hayet Edziri Mansour Sobeh Mohamed A. O. Abdelfattah Moheddine Askri Michael Knorr Carsten Strohmann Lukas Brieger Armand Soldera 《Molecules (Basel, Switzerland)》2022,27(3)
A novel series of 14 spiropyrrolidines bearing thiochroman-4-one/chroman-4-one, and oxindole/acenaphthylene-1,2-dione moieties were synthesized and characterized by spectroscopic techniques, as well as by three X-ray diffraction studies, corroborating the stereochemistry. Quantum chemical calculations studies, using the DFT approach, were performed to rationalize the stereochemical outcome. These N-heterocycles were evaluated for their antibacterial and antifungal activities against some pathogenic organisms. Several compounds displayed moderate to excellent activity towards the screened microbe strains in the study compared to Amoxicillin (AMX), Ampicillin (AMP), and Amphotericin B. Furthermore, a structural activity relationship (SAR) was established considering the synthesized compounds. Pharmacokinetic studies reveal that these derivatives exhibit an acceptable predictive ADMET profile (Absorption, Distribution, Metabolism, Excretion and Toxicity) and good drug-likeness. 相似文献
103.
A method is proposed to predict the infrared spectra of amorphous polymers. Based on classical molecular simulation and Kramers-Kronig relations, it allows the computations of absorption and transmittance spectra of polymer films in near and middle infrared domains with good agreement with experimental data. 相似文献
104.
Ichthyosan A and V are two highly elastoviscous glycan complexes present in the aqueus and vitreus [here aqueus and vitreus
are used as nouns as was suggested by Balazs and Denlinger in The eye, vol 1A. Vegetative physiology and biochemistry, 3rd
edn. Academic Press, New York, pp 533–589, 1984] of the fish eye. Ichthyosan A, with its high elastic properties, surrounds
and stabilizes the lens of the eye. Ichthyosan V, within the collagen fibers, serves as a structure stabilizer of the gel
vitreus. These two molecular complexes are non-covalent aggregates composed of hyaluronan, a chondroitin-proteoglycan (sulfate
free), and a keratan-like molecule. The ratio of hyaluronan to chondroitin–proteoglycan varies in the two ichthyosans. Electrophoretic
separation methods (both free and gel electrophoresis) demonstrate that the hyaluronan–proteoglycan aggregates move as one
molecular entity. The average molecular weight of the ichthyosan varies from 5.2 to 13.0 million in various species. Aquatic
mammals do not have ichthyosan in their eyes. 相似文献
105.
Paul Armand Joël Benoist Dominique Orban 《Computational Optimization and Applications》2008,41(1):1-25
We introduce a framework in which updating rules for the barrier parameter in primal-dual interior-point methods become dynamic.
The original primal-dual system is augmented to incorporate explicitly an updating function. A Newton step for the augmented
system gives a primal-dual Newton step and also a step in the barrier parameter. Based on local information and a line search,
the decrease of the barrier parameter is automatically adjusted. We analyze local convergence properties, report numerical
experiments on a standard collection of nonlinear problems and compare our results to a state-of-the-art interior-point implementation.
In many instances, the adaptive algorithm reduces the number of iterations and of function evaluations. Its design guarantees
a better fit between the magnitudes of the primal-dual residual and of the barrier parameter along the iterations. 相似文献
106.
Maryam Tabrizian Armand Soldera Michel Couturier C. Geraldine Bazuin 《Liquid crystals》1995,18(3):475-482
The thermotropism of 1-n-alkyl-(4-methyl and 4-tolyl)pyridinium bromides were compared for alkyl chain lengths ranging from n = 12 to 22 carbons. A smectic A mesophase is present in both series for the longer chain compounds, n ≥ 16, with the clearing temperature being similar for both series but increasing rapidly with chain length. The series with the elongated mesogen also possesses an ordered mesophase identified as smectic G. The transition between this mesophase and the SA or isotropic phase in the 4-tolyl series, and the transition to and from the crystalline phase in both series, are affected relatively little by the alkyl chain length. It seems that the SA mesophase is governed primarily by the amphiphilic character of the substances, whereas elongation of the ionic head group is responsible for the appearance of a more ordered mesophase at intermediate temperatures. 相似文献
107.
Bubacco L van Gastel M Benfatto M Tepper AW Canters GW 《Micron (Oxford, England : 1993)》2004,35(1-2):143-145
The structural basis that define the physiological functions of binuclear copper enzymes is discussed in the frame of the data generated by a broad spectroscopic approach, spanning from paramagnetic NMR and pulsed EPR to x-ray absorption spectroscopies. The structural features discussed for the different oxidation and ligation states accessible to a binuclear copper sites are the coordination geometry for the first and second shell, the metal-metal distance and the role of the bridging exogenous ligand(s). A structural model will be presented to rationalize both the differentiation in function within the protein families and the reaction mechanism of those proteins that are enzymatically active. 相似文献
108.
Patrone L Palacin S Charlier J Armand F Bourgoin JP Tang H Gauthier S 《Physical review letters》2003,91(9):096802
The transport properties of two oligothiophene derivatives, that differ only by the chemical group coupling to gold, are compared. It is shown that the role of the coupling group in the transport properties can be decoupled from that of the conjugated body of the molecules and that Se is a better electronic coupling group than S. These results are accounted for semiquantitatively within the frame of the scattering theory of transport, using results from ultraviolet photoemission spectroscopy experiments as inputs for the position in energy of the molecular orbitals with respect to the Fermi level of the electrodes. 相似文献
109.
We report that, when a train of confined droplets flowing through a channel reaches a junction, the droplets either are alternately distributed between the different outlets or all collect into the shortest one. We argue that this behavior is due to the hydrodynamic feedback of droplets in the different outlets on the selection process occurring at the junction. A "mean field" model, yielding semiquantitative results, offers a first guide to predict droplet traffic in branched networks. 相似文献
110.