207 research outputs found
The first dinuclear zinc(II) dithiocarbarnate complex with butyl substituent groups
The crystal structure of the title compound, bis( -N,N-
dibutyldithiocarbamato- 2S:S0)bis[(N,N-dibutyldithiocarba\-
forcelb]mato- 2S,S0)zinc(II)], [Zn2(C9H18NS2)4], has
been determined at 180 K. The structure contains two
crystallographically unique Zn2+ metal centres, showing
almost identical slightly distorted tetrahedral coordination
environments, and forming a dinuclear complex with two
skew-bridging syn-N,N-dibutyldithiocarbamate ligands. Two
other dithiocarbamate ligands are connected to the Zn2+
centres in a syn,syn-chelate coordination mode
Aerosol-assisted metallo-organic chemical vapour deposition of Bi2Se3 films using single-molecule precursors: the crystal structure of bismuth(m) dibutyldiselenocarbamate
The complexes [Bi{Se2CN(C2H5)2}3], [Bi{Se2CN(C4H9)2}3], [Bi{Se2CN(CH3)(C4H9)}3] and
[Bi{Se2CN(CH3)(C6H13)}3] have been synthesized and characterized structurally using IR, 1H and 13C NMR. In
addition, the crystal structure of [Bi{Se2CN(C4H9)2}3] was determined by single-crystal X-ray diffraction,
showing the bismuth centre coordinated to three dialkyldiselenocarbamate ligands through the selenium donor
atoms. The Bi(III) compounds were used as precursors for the deposition of Bi2Se3 films on glass substrates
through aerosol-assisted metallo-organic chemical vapour deposition (AA-MOCVD)
A novel supramolecular organic-inorganic adduct containing alpha-Keggin-type [PW12O40](3-) anions and benzo-15-crown-5 molecules
The structure of the title compound, tris(hydroxonium) 12-
phosphato-tetracosa- 2-oxo-dodecaoxododecatungsten hexakis(
benzo-15-crown-5)±methanol±water (1/1/1), (H3O)3-
[PW12O40] 6C14H20O5 CH3OH H2O (where C14H20O5 is
benzo-15-crown-5), has been determined at 180 K.
[PW12O40]3ÿ
anions are typical of -Keggin structures, and
the [H3O (C14H20O5)2]+ sandwich-type moieties contain a
large number of short O O close contacts, suggesting strong
hydrogen bonding within them
Self-Assembled Triply Periodic Minimal Surfaces as moulds for Photonic Band Gap Materials
We propose systems with structures defined by self-assembled triply periodic
minimal surfaces (STPMS) as candidates for photonic bandgap materials. To
support our proposal we have calculated the photonic bands for different STPMS
and we have found that, at least, the double diamond and gyroid structures
present full photonic bandgaps. Given the great variety of systems which
crystalize in these structures, the diversity of possible materials that form
them and the range of lattice constants they present, the construction of
photonic bandgap materials with gaps in the visible range may be presently
within reach.Comment: 3 pages, 2 figures, RevTe
Electronic structure of periodic curved surfaces -- topological band structure
Electronic band structure for electrons bound on periodic minimal surfaces is
differential-geometrically formulated and numerically calculated. We focus on
minimal surfaces because they are not only mathematically elegant (with the
surface characterized completely in terms of "navels") but represent the
topology of real systems such as zeolites and negative-curvature fullerene. The
band structure turns out to be primarily determined by the topology of the
surface, i.e., how the wavefunction interferes on a multiply-connected surface,
so that the bands are little affected by the way in which we confine the
electrons on the surface (thin-slab limit or zero thickness from the outset).
Another curiosity is that different minimal surfaces connected by the Bonnet
transformation (such as Schwarz's P- and D-surfaces) possess one-to-one
correspondence in their band energies at Brillouin zone boundaries.Comment: 6 pages, 8 figures, eps files will be sent on request to
[email protected]
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