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Topic: Coordination number

	Coordination Number 1 (Site not responding. Last check: 2007-10-13)
		The concept of a coordination number is a very useful one.
		In general however, coordination numbers will be 6 and lower for the first row transition metals.
		Transition metal complexes with the coordination number 1 are rare.
	www.d.umn.edu /~pkiprof/ChemWebV2/Coordination/CN1.html (161 words)

	insurance Coordination_number - insurance-notes.com (Site not responding. Last check: 2007-10-13)
		In chemistry, the coordination number (c.n.), as defined originally in 1893 by Alfred Werner, is the sum of the total number of neighbors of a central atom in a chemical compound and the number of lone pairs on it
		It differs significantly from the chemistry definition because while diamond (which is entirely made of carbon) has a coordination number of 4, graphite (which is also entirely made out of carbon) has a coordination number of 3.
		The surface coordination number is dependent on which Miller index the surface uses.
	www.insurance-notes.com /Coordination_number (376 words)

	What Is A Coordination Compound? (Site not responding. Last check: 2007-10-13)
		A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds.
		Coordination compounds and complexes are distinct chemical species - their properties and behavior are different from the metal atom/ion and ligands from which they are composed.
		The coordination number is the number of donor atoms bonded to the central metal atom/ion.
	www.chem.purdue.edu /gchelp/cchem/whatis.html (218 words)

	The Organometallic HyperTextBook: Coordination Number and and Coordination Chemistry Definitions
		Coordinative unsaturation is an important concept in organotransition metal chemistry.
		A common means of creating the requisite vacant site is by loss of a coordinated ligand or a change in the bonding mode of a ligand (such as conversion of a trihapto allyl ligand to the monohapto form).
		The primary coordination sphere of a metal involves the set of ligands closest to the metal that are directly attached.
	www.ilpi.com /organomet/coordnum.html (1022 words)

	Coordination (Site not responding. Last check: 2007-10-13)
		Coordination polyhedra are dictated by the relative sizes of the cation and the anion.
		Studies of real crystals show that most of the time coordination number corresponds to the theoretical geometrical limits but there are exceptions at both the upper and lower limits.
		Fourfold (tetrahedral) coordination is the hardest case to visualize coordination criteria.
	www.uwsp.edu /geo/projects/geoweb/participants/Dutch/PETROLGY/coordination.htm (421 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Coordination complexes were known - although not understood in any sense - since the beginning of chemistry, e.g.
		Thus, coordination chemistry is the chemistry of the majority of the periodic table.
		Ligands are generally bound to a metal ion by a coordinate covalent bond (donating electrons from a lone electron pair into an empty metal orbital), and are thus said to be coordinated to the ion.
	www.maxpedia.org /cgi-bin/mp/m.pl?la=en&sw=complex+(chemistry)+ (325 words)

	Chapter 2: Coordinations around hydrogen
		This picture is therefore a typical coordination, where an assignment of the coordination number 2 for hydrogen seems out of any discussion.
		The coordination number in this case has to be expanded at least to 3.
		Continuing in a circle with the first example again, we should be no longer sure to treat it as coordination number 2 and so we may end up with multi-furcated O-H-bonds in all cases.
	www.cryst.bbk.ac.uk /PPS2/projects/loesel/chap02.htm (395 words)

	Alexander Technique: The Insider's Guide
		(Coordination includes movement, posture, breathing, and tension patterns.) He had come to the understanding that the mind and body function as an integrated entity, a rather unusual realization for that time.
		Though the child or adult may eventually sense that something is wrong with his movement, posture, or other aspects of his functioning, his senses involved in coordination (proprioception) have become so altered by his habits that he finds he can't rely on these senses when he tries to make changes and improvements.
		The number of lessons a student may decide to take can depend on factors such as individual conditions, rate of progress, and the particular improvements the student may be seeking.
	www.alexandercenter.com (2238 words)

	Coordination Person Number
		Coordination Numbers are calculated by taking DD and adding 60 and by using the modulus 10 method with the magnitudes 1 and 2 to calculate the checksum.
		M digits is a value from 6 to 9 so the number is a coordination number.
		Coordination numbers are used by the Swedish authorities as a common means of identification for people that are not registered in the Swedish Population Registry and were introduced on 1 January 2000.
	www.auldenfire.com /alss/bnftdetail/bencpn.shtml (220 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		The structures of organosilicon compounds in which the coordination number of silicon is other than 4 are examined.
		Examples of compounds in which the coordination number of silicon is greater than five are also examined.
		Attention is concentrated on the geometry of compounds with an increased coordination number of silicon atoms as intermediates in chemical reactions.
	www.turpion.org /php/paper.phtml?journal_id=rc&paper_id=3436 (136 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Our findings are that magnesium has a firm coordination number of 6 with an overwhelming preference for water or other oxygen-containing ligands.
		The energy consequences of changing the coordination number of Mg from 6 to any other number are high.
		Calcium ions appear to bind with a higher coordination number and values of 7-9 are observed in crystal structures.
	www.iucr.org /iucr-top/cong/17/iucr/abstracts/abstracts/S0250.html (306 words)

	IUPAC Gold Book
		The coordination number of a specified atom in a chemical species is the number of other atoms directly linked to that specified atom.
		For example, the coordination number of carbon in methane is four, and it is five in protonated methane, CH
		In an inorganic coordination entity, the number of σ-bonds between ligands and the central atom.
	gold.zvon.org /C01331.html (134 words)

	Chemical Bonding Concept/Skills Development (Site not responding. Last check: 2007-10-13)
		The coordination number is 12; the central atom has 12 nearest neighbors.
		The coordination number of each sodium ion is 6, which is also the coordination number of each chloride ion.
		The coordination number of sulfide ion is 4; it's also the coordination number of zinc ion in the Wurtzite lattice.
	www.okstate.edu /jgelder/bondpage18.html (497 words)

	Cofinancing - Inter-American Development Bank
		The importance of comprehensive policy dialogues was underscored by the Board of Executive Directors’ approval of sector-wide approaches (SWAps) to investment lending, as an instrument in which concerted efforts are required in a multidonor environment.
		These include 11 policy-based and 13 investment operations and a number of special activities such as support for the population and housing census program in Nicaragua, which was supported by six donor organizations.
		In addition, promising initial contacts were established with a number of major European private foundations under the aegis of the European Foundation Center.
	www.iadb.org /exr/ar2004/YL_cofinancing.cfm?language=En&parid=7&item1id=5 (949 words)

	Molecular Coordination Number (Site not responding. Last check: 2007-10-13)
		Coordination number of the propane molecule (yellow selected, (2,0,-1) projection).
		Molecular coordination number of UF is 14, as in bcc lattice (the soft sphere model).
		Number of surrounding molecule can be determine from number of faces for the VDP its centroid ('lattice' molecular VDP).
	www.topos.ssu.samara.ru /Ability_Site_Eng/Molecular_CN.htm (77 words)

	Combinatorial synthesis and analysis of organometallic compounds and catalysts - Patent 6030917 (Site not responding. Last check: 2007-10-13)
		Given the number of variables involved and the lack of theoretical capability, it is not surprising that the discovery and optimization of catalysts is laborious and inefficient.
		In general, activation by alkylation works in systems where the metal center of the catalyst precursor is highly coordinatively unsaturated and does not require further reduction of coordination number to function as a catalyst; however, this mode of activation is not limited to such metal centers.
		In preferred embodiments, the coordination numbers (CN) of the ancillary ligand are independently 1, 2, 3 or 4, and the charge on the ligands are independently 0, -1, -2, -3, or -4.
	www.freepatentsonline.com /6030917.html (16974 words)

	Chemical Theory and Computation Special Feature: Simulations of the pressure and temperature unfolding of an ... (Site not responding. Last check: 2007-10-13)
		Pressure-dependence of the average coordination number of water to the backbone carbonyl oxygen.
		Insets show the average water coordination number as a function of density and temperature to the carbonyls of two specific residues: residues 11 and 12, which are positions where the carbonyl is shielded and unshielded from water, respectively, by the lysine side chain.
		The color schemes are the same in both contours where increase in coordination corresponds to color gradient from blue to red.
	www.pnas.org /cgi/content/full/102/19/6765 (3403 words)

	A coordination number of edta ca2+ structure vitamins (Site not responding. Last check: 2007-10-13)
		A coordination number of 2 corresponds with a linear geometry; a coordination number of 4 corresponds with either a tetrahedral or square planar molecular geometry; and a coordination number of 6 corresponds with an octahedral geometry.
		Coordination numbers, or edta ca2+ structure the number of bonds formed between the metal ions and ligands,
		can extend higher; it becomes very difficult to measure the number of ligands after about edta ca2+ structure 8, and large numbers of ligands are uncommon.
	www.casinoonlineusa.com /drugs/bdir120/1/46.htm (306 words)

	Ch110_Lec 34_21 November
		The number of each ligand is indicated using Greek prefixes (di- = 2, tri- = 3, tetra- = 4, penta- = 5, and hexa- = 6).
		The oxidation number of the central atom is indicated with a Roman numeral as in the Stock System for naming cations, e.g.
		The stereoisomerism of complex ions can be organized by coordination number, with the most important coordination numbers for stereoisomers being 2, 4, and 6.
	www.humboldt.edu /~rap1/C110.F03/C110Notes/C110_lec34.htm (490 words)

	Coordination Number (Site not responding. Last check: 2007-10-13)
		The coordination number (CN) is the number of nearest neighbors of a given particle in the crystal lattice.
		The most common coordination numbers are 4, 6, 8, and 12.
		determine the coordination number of an atom or ion in a unit cell
	www.pearsoncustom.com /wertz/a_cd/cams/html/c08_solids/s04_cn_s.html (52 words)

	Coordination Number Of Zr In Zirconia
		Coordination number of Zr atom is 7; Zr{O distances are 0.205 nm...
		This feature can be explained by a lower O-Zr coordination number in nanosized pillars (maximum 2 for bridging oxygen anions or hydroxyls) as...
		Clean (100) surface The coordination number of the Zr4+ cation in Zr compounds ranges from...
	www.cubic-zirconia.biz /cubic-zirconia-resources/Coordination-Number-Of-Zr-In-Zirconia.html (309 words)

	CERT® Advisories
		A number of vulnerabilities have been discovered in various implementations of the multimedia telephony protocol H.323.
		The number and variety of reports we have received indicate that this is a widespread attack affecting a variety of sites.
		The CERT Coordination Center has received confirmation that some copies of the source code for the TCP Wrappers tool (tcpd) were modified by an intruder and contain a Trojan horse.
	www.cert.org /advisories (10753 words)

	Can a Hydroxide Ligand Trigger a Change in the Coordination Number of Magnesium Ions in Biological Systems? (Site not responding. Last check: 2007-10-13)
		Density functional (B3LYP) calculations indicate that a hydroxide ligand is capable of triggering a reduction in the coordination number of Mg ions from 6 to 5.
		Since this could be quite relevant in the mode of action of magnesium-containing enzymes (especially hydrolases in which a metal-bound hydroxide species is believed to play a crucial role), we have performed a systematic deprotonation study of biologically relevant magnesium complexes.
		We postulate that a hydroxide (in addition to its role as an active nucleophile) could be employed by magnesium-containing enzymes to trigger a differential coordination behavior.
	pubs.acs.org /cgi-bin/abstract.cgi/bichaw/2005/44/i12/abs/bi047454j.html (227 words)

	Chapter 4b: Electrostatic Coordination in Brucite (Site not responding. Last check: 2007-10-13)
		A picture of the electrostatic coordination along the (110)-plane in brucite is shown below.
		This gives a total electrostatic coordination number of 5 which is identical with the geometrical model for brucite under pressure or with Ca(OH)
		A different view and a better partitioning of the space is given if only the field lines are shown which mark the area between two different bonds.
	www.cryst.bbk.ac.uk /PPS2/projects/loesel/chap04b.htm (130 words)

	Coordination Numbers
		The total number of points of attachment to the central element is termed the coordination number and this can vary from 2 to as many as 16, but is usually 6.
		In simple terms, the coordination number of a complex is influenced by the relative sizes of the metal ion and the ligands and by electronic factors, such as charge which is dependent on the electronic configuration of the metal ion.
		Unknown for first row transition metal ions, although the arrangement of six groups in a plane is found in some higher coordination number geometries.
	wwwchem.uwimona.edu.jm:1104 /courses/IC10Kcnstory.html (616 words)

	Influence of coordination number and percolation probability on rock permeability estimation
		Influence of coordination number and percolation probability on rock permeability estimation
		Using these approaches, the coordination number that is important for rock modeling is included.
		Both equations show that permeability will be higher as coordination number as well as percolation probability increases.
	www.agu.org /pubs/crossref/2002/2001GL013414.shtml (257 words)

	Chemical Bonding Concept/Skills Development (Site not responding. Last check: 2007-10-13)
		From the models it will be possible to determine the coordination number of the particles of each structure.
		Count the number of spheres closest the central sphere in the structure.
		This is called the number of nearest neighbors or the coordination number.
	www.okstate.edu /jgelder/bondpage14.html (362 words)

	Cerebral Palsy Information Page: National Institute of Neurological Disorders and Stroke (NINDS)
		The term cerebral palsy refers to any one of a number of neurological disorders that appear in infancy or early childhood and permanently affect body movement and muscle coordination but don’t worsen over time.
		The most common are a lack of muscle coordination when performing voluntary movements (ataxia); stiff or tight muscles and exaggerated reflexes (spasticity); walking with one foot or leg dragging; walking on the toes, a crouched gait, or a “scissored” gait; and muscle tone that is either too stiff or too floppy.
		A small number of children have cerebral palsy as the result of brain damage in the first few months or years of life, brain infections such as bacterial meningitis or viral encephalitis, or head injury from a motor vehicle accident, a fall, or child abuse.
	www.ninds.nih.gov /disorders/cerebral_palsy/cerebral_palsy.htm (676 words)

	[No title]
		In the past 250 years of research taxonomists have named about 1.78 million species of animals, plants and micro-organisms, yet the total number of species is probably between 5 and 30 million.
		The Coordination Mechanism for the Global Taxonomy Initiative met in Montreal 20-21 November 2006.
		The final report will be available through the GTI portal on the Coordination Mechanism page.
	www.biodiv.org /programmes/cross-cutting/taxonomy (294 words)

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