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- From: Alan Lara <zabsh@swfla.rr.com>
- To: scirun-users-list@sci.utah.edu
- Subject: The bridging S and I atoms, together with the W and three Ag atoms, form a pseudo-cubane core with small angles at the non-metal vertices, resulting in short WAg distances.
- Date: Tue, 17 Jul 2007 17:04:12 +0400
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Sanchez Ballester, M. The disordered ethylenediammonium dications are
located in the eight-membered ring channels near the twofold axes.
The two axial positions are occupied by weakly coordinated pyrimidinyl N
atoms, thus giving rise to a highly distorted octahedral geometry.
Bridging by the bipyridine ligand leads to a linear chain structure and
intermolecular O-HO hydrogen bonds link the chains into a
three-dimensional network.
The Ni atom is four-coordinated by the N,N,O-donor set of the Schiff
base ligand and by the terminal N atom of the azide group, forming a
square-planar geometry. The host binuclear complex is distorted from a
rectangular shape.
The kink at the metal linkage is nearly a right angle.
The CuII ion assumes a tetrahedrally distorted square-planar
coordination geometry. The Cu atoms are linked into chains by the second
N atom of one of the pc anions bonding to an axial site of a
neighbouring Cu atom.
The anions, cations and uncoordinated water molecules are linked into a
three-dimensional network by O-HO and C-HO hydrogen bonds.
The benzophenone carbonyl group lies on a twofold rotation axis. No
significant hydrogen bonding or - interactions are observed in the
crystal structure. The propyl group on the bridging N atom is in an
equatorial position and takes a zigzag form.
One Pr atom is coordinated by eight carboxylate O atoms from five chdc
and two water molecules, whereas the other is coordinated by seven
carboxylate O atoms from five chdc and two water molecules.
The cyclopentadienyl ring is disordered, due to the symmetry of the
special position. The Dy atom exhibits a nine-coordinate distorted
tricapped trigonal-prismatic coordination geometry.
The chloroform solvent molecule interacts with the complex through a
weak C-HS hydrogen bond. The metal atom shows square-planar
coordination. The solvent molecule is disordered equally over two
inversion-related sites.
The metal atom shows tetrahedral coordination. Bridging by the
bipyridine ligand leads to a linear chain structure, while
intermolecular O-HO hydrogen bonds link the chains into a
three-dimensional network.
Bridging by the bipyridine ligand leads to a linear chain structure and
intermolecular O-HO hydrogen bonds link the chains into a
three-dimensional network.
The crystal structure involves N-HO and N-HN hydrogen bonds. The ZnII
ion displays a distorted tetrahedral geometry and is coordinated by
three O atoms and one N atom. Intermolecular C-HO and intramolecular
C-HO and O-HN hydrogen-bonding interactions help to establish the
crystal packing. The asymmetric unit consists of two half-complexes and
one water molecule of crystallization.
The chosen crystal can thus be considered enantiomerically pure. Intra-
and intermolecular O-HO and N-HO hydrogen bonds in the formation of a
supramolecular structure. A crystallographic twofold rotation axis
passes through Zn and the pyridine ligand.
Because of the different trans influences of the I atom and the methyl
group, the Pt-C bonds trans to the methyl group are longer than those
trans to the I atom. N-HO hydrogen bonding between cations and anions
and between cations helps to stabilize the crystal structure.
The bridging S and I atoms, together with the W and three Ag atoms, form
a pseudo-cubane core with small angles at the non-metal vertices,
resulting in short WAg distances. A one-dimensional chain is formed
through the dicyanamides, which act as end-to-end bridging ligands.
The slightly distorted octahedral coordination around CoII is completed
by a water molecule, which forms hydrogen bonds to link the chains into
a three-dimensional structure. The CdII atom is six-coordinated in a
severely distorted octahedral geometry by two phenolate O, two imine N
and two amine N atoms from two Schiff base ligands. The structure
features two bridged half-sandwich cyclopentadienylmanganese centers.
Intra- and intermolecular O-HO and N-HO hydrogen bonds in the formation
of a supramolecular structure.
A crystallographic twofold rotation axis passes through an F atom of the
disordered anion and the mid-point of the two Pd atoms.
The crystal packing is consolidated by O-HO hydrogen bonds to form
infinite chains.
The cations exhibit noncrystallographic inversion symmetry.
The bridging S and I atoms, together with the W and three Ag atoms, form
a pseudo-cubane core with small angles at the non-metal vertices,
resulting in short WAg distances. The OAc and bzim ligands bridge the Zn
atoms to form an infinite three-dimensional network.
The piperidine ring adopts a chair conformation.
Structural cohesion is ensured by N-HO hydrogen-bonding interactions,
which form a three-dimensional framework.
Medium-strong O-HO hydrogen bonds between the water molecules and the
layers stabilize the structure. The Cu and Sm atoms are doubly bridged
by two phenolate O atoms provided by the Schiff base ligand. The two
axial positions are occupied by weakly coordinated pyrimidinyl N atoms,
thus giving rise to a highly distorted octahedral geometry.
The Ni atom is four-coordinated by the N,N,O-donor set of the Schiff
base ligand and by the terminal N atom of the azide group, forming a
square-planar geometry.
The Cu atoms are linked into chains by the second N atom of one of the
pc anions bonding to an axial site of a neighbouring Cu atom.
One O atom and three N atoms are in the equatorial plane, and another O
atom and one N atom are in axial sites. Sanchez Ballester, M. A
one-dimensional chain is formed through the dicyanamides, which act as
end-to-end bridging ligands. Furthermore, extensive intermolecular
hydrogen-bond interactions lead to the formation of a three-dimensional
network.
- The bridging S and I atoms, together with the W and three Ag atoms, form a pseudo-cubane core with small angles at the non-metal vertices, resulting in short WAg distances., Alan Lara, 07/17/2007
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