1,721,191 research outputs found
In Memoriam – Yang Xiaoping
Full text linkIt is with the deepest sadness that we report the death of our friend and colleague, Yang Xiaoping, who died of a massive cerebral hemorrhage on September 24, 1989. Xiaoping served for two years on the staff of the Journal of Chinese Law, most recently as Translations Editor
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In Memoriam – Yang Xiaoping
No full textIt is with the deepest sadness that we report the death of our friend and colleague, Yang Xiaoping, who died of a massive cerebral hemorrhage on September 24, 1989. Xiaoping served for two years on the staff of the Journal of Chinese Law, most recently as Translations Editor
Pentanuclear Tetra-Decker Luminescent Lanthanide Schiff Base Complexes
Full text linkLuminescent pentanuclear tetra-decker Ln(III) complexes [Eu5L4(OH)(2)(NO3)(4)(H2O)]center dot NO3 center dot 3H(2)O 1, [Nd5L4(OH)(2)-(NO3)(5)MeOH]center dot 3MeOH center dot 2H(2)O2 and [Eu5L4(CF3SO3)(4)(MeO)(2)-(H2O)(4)]center dot CF3SO3 center dot H2O 3 are formed from Ln(NO)(3)center dot 6H(2)O (Ln = Eu (1), Nd (2)) and Eu(CF3SO3)(3), respectively (H2L = N, N'-bis(5-bromo-3-methoxysalicylidene)phenylene-1,2-diamine).Robert A. Welch Foundation F-816Texas Higher Education Coordinating Board ARP 0036580010-2006The Petroleum Research FundAmerican Chemical Society 47014-AC5Hong Kong Research Grants Council HKBU 202407Chemistr
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Multinuclear Cd-2, Cd-3 and 1-D Framework Structures of Cd(II) Schiff Base Complexes
Full text linkReactions of the "salen" type Schiff bases H2L1 and H2L2 with Cd(OAc)(2)center dot 2H(2)O gave complexes with Cd-2 and Cd-3 cores and an extended 1-D framework architecture [H2L1 = N,N'-(1,2-phenylenyl)bis(5-bromo-2-hydroxy-3-methoxybenzaldimine; H2L2 = N,N'-(propyl)-bis(5-bromo-2-hydroxy-3-methoxybenzaldimine)].Agapiou, Kyriacos, Michelle L. Mejía, Xiaoping Yang, and Bradley J. Holliday. "Multinuclear Cd 2, Cd 3 and 1-D framework structures of Cd (II) Schiff base complexes." Dalton Transactions 21 (Apr., 2009): 4154-4159.Chemistr
4-[Tris(1H-pyrazol-1-yl)methyl]phenol
Full text linkThe title compound, C16H14N6O, was prepared by the condensation of 4-(trifluoromethyl)phenol and sodium pyrazol-1-ide in a yield of 58%. The dihedral angles formed by the planes of the pyrazole rings are 50.7 (2), 71.2 (3) and 95.8 (2)°. The molecules are associated into dimers by pairs of intermolecular O—H...N hydrogen bonds involving the hydroxy groups and pyrazole N atoms. In addition, π–π stacking between the phenol rings of these inversion-related dimers is observed, with a ring centroid-to-centroid distance of 3.9247 (10) Å
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Syntheses, Structures, and Photoluminescence of 1-D Lanthanide Coordination Polymers
Full text linkFive new lanthanide 1-D coordination polymers are reported which are formed from flexible salen type Schiff-base ligands H(2)L and H(2)L' (H(2)L = N, N(1)-ethylene bis(salicylideneimine); H(2)L' = N,N(1)-bis(3-methoxysalicylidene) ethylene-1,2-diamine). The polymeric structures are formed by bridging neutral H(2)L units in the case of {[Ln(2)L(2)(CF(3)SO(3))(H(2)L)(4)(MeOH)]center dot CF(3)SO(3)}(n) (Ln = Eu (1), Nd (2) and Er (3)), and by acetate (OAc(-)) groups in [Yb(2)(L)(2)(OAc)(2)(MeOH)(2)](n) (4) and {[Tb(3)(L')(2)(OAc)(5)]center dot Et(2)O center dot(MeOH)(0.5)}(n) (5). The structures of 1-5 were determined by single crystal X-ray crystallographic studies and the luminescence properties of 1 and 5 in MeOH solution were determined.ong Kong Baptist University FRG/06-07/II-16Hong Kong Research Grants Council HKBU 202407Robert A. Welch Foundation F-816Texas Higher Education Coordinating Board ARP 003658-0010-2006Petroleum Research FundAmerican Chemical Society 47014-AC5Chemistr
1,1′,1′′-{[4-(3,4-Ethylenedioxythiophen-2-yl)phenyl]methanetriyl}tris(1H-pyrazole)
No full textIn the title complex, C22H18N6O2S, two of the pyrazole rings are disordered over two sets of sites with ratios of refined occupancies of 0.58 (2):0.42 (2) and 0.517 (12):0.483 (12). The dioxane ring is in a half-chair conformation and the two –CH2– groups of this ring are disordered over two sets of sites, the ratio of refined occupancies being 0.855 (19):0.145 (19). The essentially planar thiophene ring [largest deviation = 0.0444 (2) Å] forms a dihedral angle of 19.59 (3)° with the benzene ring
A Pyrrole-Based Triazolium-Phane with Nh and Cationic Ch Donor Groups as a Receptor for Tetrahedral Oxyanions that Functions in Polar Media
Full text linkThe pyrrole-based triazolium-phane 1(4+)center dot 4BF(4)(-) has been prepared via the tetraalkylation of a macrocycle originally prepared via click chemistry. It displays a high selectivity for tetrahedral oxyanions relative to various test monoanions and trigonal planar anions in mixed polar organic-aqueous media. This selectivity is solvent dependent and is less pronounced in acetonitrile. Theoretical calculations were carried out in with the chloride anion in an effort to understand the influence of solvent on the intrinsic hydrogen bonding ability of the donor groups (pyrrole N-H, benzene C-H and triazolium C-H). The host-guest interactions between receptor 1(4+)center dot 4BF(4)(-) and representative tetrahedral oxyanions were further analysed by H-1 NMR spectroscopy, and the findings proved consistent with the differences in the intrinsic strength of the various H-bond donor groups inferred from the electronic structure calculations carried out in methanol, namely that (CH)(+)-anion interactions are less important in an energetic sense than neutral CH-anion interactions in polar media. Single crystal X-ray diffraction analyses of the mixed salts 1(4+)center dot HP2O73-center dot BF4- and 31(4+)center dot 4H(2)PO(4)(-)center dot 8BF(4)(-) confirmed that receptor 1(4+) can bind the pyrophosphate and phosphate anions in the solid state.Cai, Jiajia, Benjamin P. Hay, Neil J. Young, Xiaoping Yang, and Jonathan L. Sessler. "A pyrrole-based triazolium-phane with NH and cationic CH donor groups as a receptor for tetrahedral oxyanions that functions in polar media." Chemical Science 4, no. 4 (Jan., 2013): 1560-1567.Chemistr
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