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828 research data, page 1 of 83

Planktic foraminiferal flux of sediment trap CB4_trap, lower

Zaric, Snjezana (2005)
Publisher: PANGAEA - Data Publisher for Earth & Environmental Science

Metal-Organic Frameworks Based on Trigonal Prismatic Building Blocks and the New “acs” Topology

Cationic and mixed-valent forms of Fe3O(CO2)6 trigonal prismatic clusters have been linked by ditopic links, namely, 1,4-benzenedicarboxylate (1,4-BDC) and 1,3-benzenedicarboxylate (1,3-BDC), to produce two 3-periodic metal−organic frameworks (MOFs), [Fe3O(1,4-BDC)3(DMF)3][FeCl4]·(DMF)3 (MOF-235) and Fe3O(1,3-BDC)3(py)3·(py)0.5(H2O)1.5 (MOF-236) (DMF = N,N-dimethylformamide, py = pyridine), respectively. These MOFs exemplify a new, high-symmetry topology termed acs which we identi...

Molecular Recognition in a Thermoplastic Elastomer

Selective incorporation of bisurea guests in thermoplastic elastomers with poly(tetrahydrofuran) soft blocks and bisurea containing hard blocks is observed when the distances between the urea groups of host and guest match. The incorporation leads to significant modulation of mechanical properties. With bisurea-functionalized dyes as guests, a strong difference in extractability by detergent solution was shown between dyes differing by just one methylene unit between urea groups. ...

Synthetic Control of Pt···Pt Separation and Photophysics of Binuclear Platinum Complexes

A new series of luminescent μ-pyrazolate-bridged cyclometalated platinum binuclear complexes having the formula C∧NPt(μ-pz‘)2PtC∧N (C∧N = 2-(2,4-difluorophenyl)pyridyl, pz‘ = pyrazolate for 1, 3,5-dimethylpyrazolate for 2, 3-methyl-5-tert-butylpyrazolate for 3, and 3,5-bis(tert-butyl)pyrazolate for 4) have been synthesized and characterized. The two Pt(C∧N) moieties are bridged by two μ-pyrazolate ligands in an exo-bidentate fashion. A mononuclear complex with an isolated Pt center, C∧NPt(pz)...

The Selective Preparation of an Aluminum Oxide and Its Isomeric C−H-Activated Hydroxide

An aluminum oxide [LAlO]2 (1) has been prepared by the oxidative addition of aluminum(I) monomer LAl (L = HC[(CMe)(NAr)]2, Ar = 2,6-iPr2C6H3) with molecular oxygen. The short Al−O bonds in Al2(μ-O)2 result in short Al···Al contacts and subsequent steric crowding of the Ar substituents from the two oriented L. 1 hydrolyzes to form [LAl(OH)]2(μ-O) (2). A C−H-activated aluminum hydroxide 4, an isomer of 1, however, is obtained by hydrolysis of the bulky aluminum amide 3 rather than by a conversi...

Metal−Metal Interactions in Platinum(II)/Gold(I) or Platinum(II)/Silver(I) Salts Containing Planar Cations and Linear Anions

The salts [Pt{C(NHMe)2}4][Au(CN)2]2, [Pt{C(NHMe)2}4][Ag2(CN)3][Ag(CN)2], [Pt(en)2][Au(CN)2]2, [Pt(en)2][Ag(CN)2]2, and [Pt(bipy)2][Au(CN)2]2 have been prepared by mixing solutions of salts containing the appropriate cation with solutions of K[Au(CN)2] or K[Ag(CN)2]. Because the platinum atom in the cation is sterically protected, the structures of [Pt{C(NHMe)2}4][Au(CN)2]2 and [Pt{C(NHMe)2}4][Ag2(CN)3][Ag(CN)2] reveal no close metal−metal interactions. Colorless crystals of [Pt(en...

Last of the Wild Project, Version 2, 2005 (LWP-2): Global Human Influence Index (HII) Dataset (Geographic)

Wildlife Conservation Society - WCS; Center for International Earth Science Information Network - CIESIN - Columbia University (2005)
Publisher: Palisades, NY: NASA Socioeconomic Data and Applications Center (SEDAC)
The Global Human Influence Index Dataset of the Last of the Wild Project, Version 2, 2005 (LWP-2) is a global dataset of 1-kilometer grid cells, created from nine global data layers covering human population pressure (population density), human land use and infrastructure (built-up areas, nighttime lights, land use/land cover), and human access (coastlines, roads, railroads, navigable rivers). The dataset is produced by the Wildlife Conservation Society (WCS) and the Columbia University Cente...

Phase Behavior of Nanoparticles in a Thermotropic Liquid Crystal

In this work, we describe the outstanding behavior of a nanocomposite system composed of the thermotropic liquid crystal 5CB doped with nanoparticles of the magnetic iron oxide maghemite (γ-Fe2O3). We show that the I−N transition is associated with a reversible gathering of nanoparticles inside droplets of the ferronematic phase coexisting with a nonmagnetic nematic host phase.