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Topic: Cluster compound

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In the News (Thu 31 May 12)

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	Rehfisch Thesis Chap 5 Residence Groups
		The Compound Head cannot impose this sanction himself; but in virtue of his seniority, he may be able to mobilise outside public opinion against a person who refuses to comply with the dictate of those living in the compound.
		The inhabitants of a cluster are usually referred to as the inhabitants of a named place, the named place being the area of the hamlet in which the cluster is to be found.
		No reason was given for his compound not being a part of the nearby cluster; the probable reason is that his values are somewhat different, namely his interest in money and that he has not resided in the village for a very long time.
	lucy.ukc.ac.uk /Fdtl/Rehf/Publications/rehf_5.html (18779 words)

	Cluster compound microelectronic component - US Patent 5350930 (Site not responding. Last check: 2007-10-08)
		Microelectronic component according to claim 2, wherein a layer of molecular clusters of the cluster compound are bonded together to form the component body by being bonded to the connecting electrodes.
		Microelectronic component according to claim 24, wherein a layer of molecular clusters of the cluster compound are bonded together to form the component body by being bonded to the connecting electrodes.
		In this connection, it has been recognized that cluster compounds with metallic cluster nucleus with the correct selection of size in their properties anyhow lie at the boundary between metal and semiconductor, while cluster compounds of semiconductor materials are to be placed near the semiconductor/insulator transition in their properties.
	www.patentstorm.us /patents/5350930.html (6544 words)

	Preparation of colloidal dispersions of ruthenium, rhodium, osmium and iridium by the polymer-catalyzed decomposition ...
		In referring to such compounds, the term "labile" as used herein is intended to signify that the carbonyl ligands in the compound readily become dissociated from the molecule to leave the elemental transition metal.
		On the other hand, if the transition metal cluster compound is a solid, as is typically the case with these large molecules, it may first be dissolved in a small amount of a suitable solvent for incremental addition, or it may be added as a powder with, for example, a powder dosing funnel.
		Depending upon the amounts of polymer and transition metal cluster compound employed, colloidal transition metal dispersions according to the invention, with the transition metal particles bound to the polymer molecules may be prepared having a weight ratio of transition metal to polymer within the range of from about 10:100 to about 90:10.
	www.freepatentsonline.com /4252678.html (5965 words)

	Cluster compound microelectronic component - Patent 5350930
		The cluster nucleus of the cluster molecules is formed of atoms of a transition metal, preferably silver (Ag), gold (Au), cobalt (Co), palladium (Pd), platinum (Pt), rhodium (Rh), Ruthenium (Ru).
		Microelectronic component according to claim 24, wherein the cluster nucleus of the cluster compound consists of atoms of a transition metal.
		The size of the cluster molecule is also of considerable importance for the teaching of the invention, and in this regard, the atoms the cluster nuclei are present as two shells in close-packed sphere packing of M.sub.55 (55 metal atoms) form or larger.
	www.freepatentsonline.com /5350930.html (6586 words)

	Search Results for cluster - Encyclopædia Britannica
		Spherical clusters are dense and consist almost exclusively of elliptical and S0 galaxies.
		Irregular clusters are large, loosely structured assemblages of mixed galaxy types (mostly spirals and ellipticals), totaling perhaps 1,000 or more systems and extending out 10,000,000 to 50,000,000...
		Clusters smaller and less massive than the globulars are found in the plane of the Galaxy intermixed with the majority of the system's stars, including the Sun.
	www.britannica.com /search?query=cluster&submit=Find&source=MWTEXT (400 words)

	Gold - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-08)
		Gold ions in solution are readily reduced and precipitated out as gold metal by the addition of virtually any other metal as the reducing agent.
		Although gold is a noble metal it can form many compounds (auric chloride and chloroauric acid are the most common).
		There is only one stable isotope of gold, and 18 radioisotopes with Au-195 being the most stable with a half-life of 186 days.
	encyclopedia.worldsearch.com /gold.htm (2530 words)

	W0279: Structural Studies of the Effects of Doping the Cluster Compound Ti2Nb6Cl14O4 with In+ Or Tl+ Ions (Site not responding. Last check: 2007-10-08)
		W0279: Structural Studies of the Effects of Doping the Cluster Compound Ti2Nb6Cl14O4 with In+ Or Tl+ Ions
		If the niobium cluster is paramagnetic, these compounds have the potential for interesting magnetic interactions between the cluster and titanium ions due to short Nb-Ti distances.
		ions is compensated by substitution of some chlorine by oxygen which leads to the cluster electronic configuration being intact.
	www.hwi.buffalo.edu /ACA/ACA98/abstracts/text/W0279.html (210 words)

	PMID: 15516109 (Site not responding. Last check: 2007-10-08)
		Positive and negative ions generated by laser-based ionization methods from three gold:thiolate cluster compounds are mass analyzed by time-of-flight mass spectrometry.
		Irradiation of neat films (laser desorption/ionization) and films generated by dilution of the cluster compounds in an organic acid matrix (matrix-assisted laser desorption/ionization) with a nitrogen laser (337 nm) produced distinct ion abundances that are relevant to different structural aspects of the cluster compound.
		Matrix-assisted laser desorption/ionization produces either ions with m/z values consistent with the core mass of the cluster compounds or ions with m/z values consistent with the approximate molecular weight of the cluster compounds, depending on ionization conditions.
	lethargy.swmed.edu /cgi-bin/etblast/abstract_local?pmid=15516109&user_id=107540026 (222 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		These compounds were found to be semiconductors, thus supporting that an energy gap in the band structure of the Chevrel phase may have significant advantages when its cluster v EC number is around 4, e.
		This is a pseudo binary compound with a VEC of four.
		A method as in claim 3, wherein said Chevrel phase has a cluster valence electron quotient, calculated by adding the valence electrons of M atoms to the valence electrons of the Mo atoms, subtracting the number of electrons required to fill the octets of the chalcogen atoms and dividing by the number of Mo atoms.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=02/05366.030410&ELEMENT_SET=DECL (3526 words)

	Tetrahedrane - Wikipedia, the free encyclopedia
		In this compound one of the silicon atoms of the cage has lost a silyl substituent and carries a negative charge.
		The dimer does not materialize but a reaction with iodine in benzene followed by reaction with the tri-tert-butyl sila anion results in the formation of an eight membered silicon cluster compound which can be described as a Si dumbbell (length 229 picometer and with inversion of tetrahedral geometry) sandwiched between two almost parallel Si rings.
		In known eight-membered clusters of in the same carbon group, tin Sn and germanium Ge the cluster atoms are located on the corners of a cube.
	en.wikipedia.org /wiki/Tetrahedrane (670 words)

	Dalton Transactions Articles
		The molecular structure of the Ge cluster compound shows a highly different arrangement of the eight germanium atoms in the cluster core with respect to the only other Ge cluster compound where amido ligands are bound to the germanium atoms.
		Quantum-chemical calculations reveal that the distinct arrangement of the germanium atoms can be traced back to a different bonding situation inside the cluster frameworks, which is induced by the different ligands attached to the germanium atoms.
		These experimental and theoretical results show that the ligands are not only necessary for protecting the cluster core against the exterior but also have a strong influence on the bonding situation and therefore on the electronic situation inside the cluster core.
	www.rsc.org /Publishing/Journals/DT/article.asp?doi=b508379f (235 words)

	Georgia Tech :: Chemistry & Biochemistry :: Faculty :: Robert L. Whetten
		Gas-phase clusters generated in advanced sources provide a good match to this complexity, because they can be generated and studied over a wide range of size-, composition-, coverage-, and charge-states.
		Besides adsorption-desorption isotherms and kinetic parameters, the properties of clusters and their cluster-adsorbate complexes can be determined by infrared and photoelectron spectroscopy.
		Carbon Clusters as Model Soot-catalysts-Adsorption and Reaction with SO Carbon clusters serve as appropriate model compounds for fl-carbon soot, a particularly active form of elemental carbon that has been shown to be responsible, in part, for catalyzed atmospheric reactions in polluted atmosphere.
	www.chemistry.gatech.edu /faculty/Whetten (988 words)

	School of Physics: Documents--Isolation and Selected Properties of a 10.4 kDa Gold:Glutathione Cluster Compound (Site not responding. Last check: 2007-10-08)
		The compound is optically active, as evidenced by circular dichroism in the near-IR, visible, and near-UV regions.
		C NMR spectra suggest that the bonding environment of the GS-adsorbate is similar to that of the n-alkyl-adsorbate clusters, and the nonsulfhydryl properties are retained.
		The cluster is thus envisioned as a large metallic-cluster compound with distinctive optical properties encapsulated by a bioactive peptide monolayer.
	www.physics.gatech.edu /documents/abstracts/AuSG_JPC.html (232 words)

	IMM Reports No. 11
		The clusters grow when surface Mo species are reduced to Mo, after which "the intermediate cluster acts both as nucleophile and template in directing the formation of two further electrophilic molybdenum-oxide based intermediates [a yet larger cluster]." Perhaps tunneling currents from an STM could selectively reduce atoms on one of these clusters.
		In the case of the ring cluster, "it is possible to generate deliberately discrete structural defects..." which could be used as handles to incorporate the ring into a larger structure with a selected orientation.
		This cluster compound is important because it is an atomically precise conducting cluster.
	www.imm.org /Reports/Rep011.html (2981 words)

	Read about Gold cluster compound at WorldVillage Encyclopedia. Research Gold cluster compound and learn about Gold ... (Site not responding. Last check: 2007-10-08)
		Search for Gold cluster compound in other articles.
		Look for Gold cluster compound in Wiktionary, our sister dictionary project.
		Look for Gold cluster compound in the Commons, our repository for free images, music, sound, and video.
	encyclopedia.worldvillage.com /s/b/Gold_cluster_compound (156 words)

	TITLES PLUS ABSTRACTS
		The title compound 2,4-dichloro-6-exo-9-endo-bis(dimethylphenylphosphino)-arachno-decaborane has a typical arachno ten-vertex cluster geometry with one of the phosphine ligands bound exo polyhedrally and the other in an uncommon endo configuration.
		All compounds 1 - 4 were characterised by spectroscopic methods and, in the cases of 1a and 4 by single-crystal X-ray diffraction analysis.
		Compounds 1 and 3 are characterised by single-crystal X-ray diffraction analysis and NMR spectroscopy.
	www.chem.leeds.ac.uk /boronweb/TITLESPLUSABSTRACTS.htm (2454 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		The compound for mass spectroscopic analysis is injected into a high vacuum where the molecules can move freely in the evacuated space.
		While some fragmentation of the sample molecules is necessary for structure evaluation, many compounds are so effectively fragmented by EI that no appreciable population of molecular ions survives to give an indication of the molecular weight in the mass spectrum.
		Although mass spectrometry has been used successfully in the determination of many compounds (usually having a molecular weight of less than 1,000), one consistent obstacle is whether a compound of interest is amenable to vapor phase analysis.
	www.chem.duke.edu /~reese/exp2/exp2.html (2374 words)

	Gold Assay Techniques
		The second type is (2) abnormal cluster compound ores made up of metals, semi-metals, and non-metals found with high concentrations of iron.
		The physics and chemistry of cluster science examines the behavior and phenomenon of these microcrystalline forms of matter.
		The third category involves a close association with the cluster compounds that interfere with the expression of the precious metals normal properties.
	www.ieasysite.com /consumerscigroup/consumer_science_group_008.htm (641 words)

	Metal cluster compounds (from chemical bonding) -- Encyclopædia Britannica
		A metal cluster compound is one in which metal atoms are linked directly to one another (Figure 20).
		More results on "Metal cluster compounds (from chemical bonding)" when you join.
		The class includes such compounds as tetraethyl lead—an antiknock gasoline additive and ferrocene, a remarkably stable compound in which an iron atom is “sandwiched” between two hydrocarbon rings.
	www.britannica.com /eb/article-43447 (736 words)

	Messerle: Cluster Compound Imaging (Site not responding. Last check: 2007-10-08)
		This is advantageous because at high energies the human body is transparent to X-rays, so imaging of clusters with higher energy X-rays would reduce the absorbed radiation dose.
		By combining Ta and W in a metal halide cluster, a dual energy absorbing cluster would be obtained.
		If made biocompatible, it could be used for quantitative imaging of bone density to assess the degree of osteoporosis in postmenopausal women and the elderly.
	www.uiowa.edu /%7Eoxygen/messerle1.htm (155 words)

	Research Interests of the Atwood Group (Site not responding. Last check: 2007-10-08)
		Applied work is concerned with the development of Lewis acid catalysts made from cationic aluminum compounds, olefin polymerization co-catalysts from anionic aluminum compounds, and the formation of solid-state materials which contain a group 13 element.
		Additionally, the compounds where this type of bonding occurred were not amenable to further study.
		As a result the compounds, one example of which shown in Figure 4, are not air or moisture sensitive.
	www.chem.uky.edu /research/atwood (2380 words)

	A New Bacterial Steroid Degradation Gene Cluster in Comamonas testosteroni TA441 Which Consists of Aromatic-Compound ... (Site not responding. Last check: 2007-10-08)
		Intermediate compounds accumulating in the cultures of the gene disruption mutants of TA441 incubated with testosterone (a through e) or androsterone (f and g).
		Data are represented in three-dimensional HPLC charts (the vertical axis indicates wavelength, the horizontal axis indicates reaction time, and the UV absorbance of each compound is represented in contour).
		not by aromatic compounds [phenol, biphenyl, and 3-(3-hydroxyphenyl)propionic
	aem.asm.org /cgi/content/full/69/8/4421 (3922 words)

	mainframe (Site not responding. Last check: 2007-10-08)
		A current theme of research in the cluster group is incorporating charge into the cluster-ligand system in order to direct assembly of cluster networks.
		If we can prepare clusters to which TTF or its derivatives are directly attached, and maintain good intercluster coupling between the pi-systems of TTFs, we would have generated an electronically multi-dimensional system.
		The clusters are in an ABCABC × × × closest packing arrangement and each cluster is in van der Waals contact with six of its neighbors and in close contact with an additional six neighbors.
	www.chem.cornell.edu /fjd3/cluster/mainframe.htm (993 words)

	Kevin Gable: Metal Oxo Chemistry
		Under the conditions of the catalytic reaction, further O-atom transfer oxidizes this tetranuclear cluster to a green trinuclear cluster (isolated as a perrhenate).
		On the left is our X-ray crystal structure of the tetranuclear cluster; on the right is the eventual oxidized cluster (a dication), which had been previously reported by the Herrmann group from Munich.
		We are exploring issues such as the influence of the ligand on the structure and properties of the dioxo compound, the influence of water and other competing ligands on the O-atom transfer, and particularly in whether the mechanism of this atom transfer reaction can be related to that of the diolate cycloreversions.
	www.chem.orst.edu /personalhomepages/gable2.htm (801 words)

	Instrument Systems - Science - Single Crystal Diffractometer (Site not responding. Last check: 2007-10-08)
		Target compounds that could be studied include the clusters [HRu10C(CO)24]- and [HOs10C(CO)24]- (Jackson et al., 1982; Bailey et al., 1989), which are strongly suspected to harbor four-coordinate hydrogen atoms, and the clusters [HRh12N2(CO)23]3- and [HNi38C6(CO)42]5- (Martinengo et al., 1986; Ceriotti et al., 1986), which are likely candidates for seven-coordinate and eight-coordinate hydrogen, respectively.
		If L and M are transition-metal ions, the orbital interactions in the resulting compound can be described by well-understood principles, and it is therefore possible to tune the compound's magnetic properties.
		For the tricobalt compound Co3(dpa)4Cl2 (1), there are "bond stretch" isomers that can be isolated from the same solution as crystals in either symmetrical s-Co3(dpa)4Cl2·CH2Cl2 or unsymmetrical u-Co3(dpa)4Cl2·2CH2Cl2 forms (Chart I), as reported by Clerac et al.
	www.sns.gov /users/instrument_systems/science/crystal.shtml (2524 words)

	Abdessadek Lachgar - Research Interests and Publications
		Three types of compounds, binary indium phosphates (In-PO), ternary indium phosphates (A-In-PO, A = cation), and mixed indium-transition metal phosphates are investigated.
		The project involves the systematic study of niobium oxychlorides containing octahedral Nb (L = Cl, O) clusters to reach a fundamental understanding of the correlation between the cluster configuration and the framework dimensionality.
		Our strategy is to use a combination of ligands to make compounds with new structure types, and perhaps interesting magnetic or conductivity properties.
	www.wfu.edu /academics/chemistry/faculty/AbdessadekLachgarResearch.html (645 words)

	Using the Rule-Based Optimizer
		To execute the statement, Oracle applies the cluster's hash function to the hash cluster key value specified in the statement to obtain a hash value.
		The RBO assumes that executing the compound query using two index scans is faster than executing the original query using a full table scan.
		Executing the compound query with a full table scan in addition to an index scan could not possibly be faster than executing the original query with a full table scan.
	www.cs.uvm.edu /oracle9doc/server.901/a87503/rbo.htm (3990 words)

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