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Topic: Trigonal pyramid (chemistry)

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	TRIGONAL PYRAMID (CHEMISTRY) FACTS AND INFORMATION (Site not responding. Last check: 2007-11-07)
		In chemistry, a trigonal pyramid is a molecular_geometry with one atom at the apex and three atoms at the corners of a trigonal base.
		The three hydrogen atoms are repulsed by the electron lone_pair in a way that the geometry is distorted to a trigonal pyramid with bond angles of 107Â°.
		In ammonia the trigonal pyramid undergoes rapid nitrogen_inversion
	www.flowergods.com /Trigonal_pyramid_(chemistry) (138 words)

	Trigonal Pyramid Geometry
		An example of trigonal pyramid molecular geometry that results from tetrahedral electron pair geometry is NH The nitrogen has 5 valence electrons and thus needs 3 more electrons from 3 hydrogen atoms to complete its octet.
		The molecule is trigonal pyramid molecular geometry because the lone electron pair, although still exerting its influence, is invisible when looking at molecular geometry.
		The molecule is three dimensional as opposed to the boron hydride case which was a flat trigonal planar molecular geometry because it did not have a lone electron pair.
	www.elmhurst.edu /~chm/vchembook/205trigpyramid.html (338 words)

	Chapter 2 (Site not responding. Last check: 2007-11-07)
		This structure is shown where the N atom and its lone electron pair are at the apex of a trigonal pyramidal.
		In a trigonal pyramidal structure, the central atom is at the apex, and there is an atom at each of the corners of the base.
		One of the fluorine atoms is at the apex of the pyramid and the other four fluorine atoms occupy the corners of the square base of the pyramid.
	www.2bengineer.net /chemistry\ch2_2_6.html (1334 words)

	Structural Chemistry Tutorial Page (Site not responding. Last check: 2007-11-07)
		This is an example of a trigonal pyramidal molecule.
		These molecules have four atoms in the shape of a pyramid with a base in the shape of a triangle.
		Some trigonal pyramidal molecules will not have a symmetrical base because the angles will not all be the same.
	www.stolaf.edu /depts/chemistry/courses/toolkits/125/mo/shawn/trig2.htm (148 words)

	Meningar.com om trigonal. Trigonal, bipyramidal, planar mm.
		From the trigonal tetartohedric type II trigonal bipyramid (Figure 2c, Part Ten) can be derived the ogdohedric type II trigonal monopyramid by applying hemimorphy...
		TRIGONAL PYRAMIDAL Molecules with three atoms and one pair of nonbonding electrons around a central atom such as NH3 are trigonal pyramidal...
		TRIGONAL PLANAR - Bond angle = 120 Molecules with three atoms around a central atom such as BF3 are trigonal planar because electron repulsion is minimized by positioning the three attachments toward the corners of an equilateral triangle...
	www.meningar.com /trigonal.html (1388 words)

	Cotton, F. Albert - concerning : Early Ideas in the History of Quantum Chemistry.
		By the average student, I mean one who does not aspire to be a theoretician but who wants to have a feel for the strategy used by theoreticians in treating problems in which symmetry properties are important and to have a working knowledge of the more common and well-established techniques.
		I feel that the great power and beauty of symmetry methods, not to mention the prime importance in all flelds of chemistry of the results they give, make it very worthwhile for all chemists to be acquainted with the basic principles and main applications of group theoretical methods.
		The connection between the symmetry of the resulting set of hybrids and the d orbital used is absolutely rigorous on the basis of sym- metry alone, but only by calculations (which are not practicable at present) could we determine which set of hybrids and hence which sym- metry would be favored in a particular molecuie.
	www.quantum-chemistry-history.com /Cotton1.htm (1326 words)

	Shape of Ammonia (Site not responding. Last check: 2007-11-07)
		My view of a pyramid with a square base does not coincide with the pyramidal shape of ammonia.
		I need this information for a presentation and my general chemistry book from 1977 is very moldy in the garage.
		As you suppose, the three hydrogen atoms form a triangle and the nitrogen atom is out of the plane and equidistant from the hydrogen atoms.
	www.newton.dep.anl.gov /askasci/chem00/chem00309.htm (362 words)

	Chemistry: The Central Science, Chapter 9, Section 2
		As noted earlier, we call this shape trigonal pyramidal (a pyramid with an equilateral triangle as its base).
		We see that the trigonal pyramidal molecular geometry of NH is a consequence of its tetrahedral electron-domain geometry.
		The most stable electron-domain geometry for five electron domains is the trigonal bipyramid (two trigonal pyramids sharing a base).
	wps.prenhall.com /wps/media/objects/166/170888/blb0902.html (2470 words)

	2002 RSC Annual Report - Inorganic Stereochemistry and Asymmetric Synthesis
		oordination chemistry has merged with organic and organometallic chemistry and with catalysis with the result that there are now modifications available for nearly every standard reaction for converting achiral organic precursors into chiral products.
		In the solid state, the stereochemistry around the arsenic in these complexes is a trigonal pyramid in which the phosphorus atom occupies the apical position, orthogonal to the plane of the trigonal sp
		The geometry of the E atom is that of a trigonal pyramid: the substituents R
	rsc.anu.edu.au /about/AnnualReport/Report2002/AH-report.html (1129 words)

	bio.auc.dk/~lh [K6 - Inorganic Chemistry] (Site not responding. Last check: 2007-11-07)
		A tetragonal distortion of an octahedron involves either a shortening or a lengthening of the bond distances along one L-M-L axis, as shown in structure 6-IV.
		Trigonal distortion of an octahedron results in structure 6-VIII.
		Show with drawings how axial-equatorial exchange in a square pyramidal complex AB could occur via a tbp intermediate.
	www.miljoe.auc.dk /~lh/k6/lec5svar.html (257 words)

	Chemistry 1B (Site not responding. Last check: 2007-11-07)
		Chemistry 1B is the second quarter of our introductory series.
		The concepts learned from this course are instrumental for future studies in all areas of chemistry including biochemistry, environmental chemistry and theories of materials.
		Would the bond angle be that of a trigonal pyramid of less than 109.5.
	www.chemistry.ucsc.edu /teaching/Winter00/Chem1B (1713 words)

	Mineralogee.com
		Trigonal prism: tri-gonal, tri means 3, so this is a 3-faced prism.
		Rhombic pyramid: rhomb is a four sided figure.
		Trigonal dipyramid: tri-gonal di-pyramid, a 3x2 or 6-faced form.
	www.ntnu.no /~krill/mineralogee (4599 words)

	AP CHEMISTRY LECTURE NOTES
		O and HF are all tetrahedral if we only look at e- pair geometry, however the shapes vary in their descriptions.
		O has 4 bonds, 2 C-H bonds and a double bond C=O. The molecule is trigonal planar geometry.
		Trigonal bipyramidal structures involve the hybridization of an s, 3 p's and a d orbital resulting in 5 equal energy hybrids: sp
	staffweb.psdschools.org /rjensen/apnotes/c9notes.htm (2186 words)

	macosx.com - The Answer to Mac Support - Icons (Site not responding. Last check: 2007-11-07)
		The AOL Instant Messenger icon is a trigonal pyrammid (A triangle on all four sides/faces of a 3D triangle) with part of the inside hollowed out with a sphere inside of it.
		The sphere is a dark pearlescent blue with reflections of each of the trigonal pyramid's corners visible.
		The trigonal pyramid is a lighter pearlescent blue.
	www.macosx.com /forums/showthread.php?t=12639 (527 words)

	Darling Models: Price List
		Parts may be used to model tetrahedral, trigonal bipyramid, octahedral, square planar, and square pyramid shapes with atom ball centers.
		Parts may be used to model tetrahedral, trigonal bipyramid, octahedral, square planar, and square pyramid shapes.
		A kit consists of 60 soft trigonal atoms with phosphors to glow in either purple, green or blue.
	www.webcom.com /darling/prices.html (646 words)

	Chapter 13 & 14 Summary
		3 3 trigonal planar =120º sp
		4 3 trigonal pyramid <109.5º
		5 5 trigonal =120º or sp
	limestone.k12.il.us /teachers/kbaker/03-04/5th_6_Wks/Chemistry/Ch_13_14_Summary.htm (598 words)

	International Union of Pure and Applied Chemistry
		Bent's rule - In a molecule, smaller bond angles are formed between electronegative ligands since the central atom, to which the ligands are attached, tends to direct bonding hybrid orbitals of greater p character towards its more electronegative substituents.
		Berry pseudorotation - A mechanism for the interconversion of trigonal bipyramid structures ( 1a and 1b) through an intermediate (or transition state) tetragonal pyramid structure 2.
		It may be visualized as two synchronized bending motions by which a pair of apical ligands (1 and 2) exchange their positions with a pair of equatorial ones (3 and 4), whereas one equatorial ligand (5) described as "pivotal" remains unchanged.
	www.iupac.org /reports/1999/7110minkin/b.html (2132 words)

	[No title]
		The energy of an electron in a Bohr atom depends on a) only the value of n b) the shape of the orbital c) the value of R d) is described by the quantum number q 22.
		The hybridization of the central atom in a molecule that is described as trigonal planar is a) sp3 b) sp2 c) sp d) sp3d CHEMISTRY 105 FINAL EXAM PAGE 3 23.
		a) the molecule is trigonal planar b) the lewis dot structures will include resonance forms c) the bonds are polar and the molecule is polar d) all of the sulfur-oxygen bonds will be equal in length 34.
	www.snc.edu /chem/generalchem/final.doc (2091 words)

	Coordination Numbers (Site not responding. Last check: 2007-11-07)
		The chemistry of molecules centred around a tetrahedral C atom is covered in organic courses.
		Unknown for first row transition metal ions, although the arrangement of six groups in a plane is found in some higher coordination number geometries.
		Most trigonal prismatic compounds have three bidentate ligands such as dithiolates or oxalates and few are known for first row transition metal ions.
	wwwchem.uwimona.edu.jm:1104 /courses/IC10Kcnstory.html (455 words)

	shapes of molecules and ions containing single bonds
		When you deal with transition metal chemistry, you will be expected to know the shapes of some ions formed by transition metals, but not to work them out.
		Ammonia is pyramidal - like a pyramid with the three hydrogens at the base and the nitrogen at the top.
		The 5 electron pairs take up a shape described as a trigonal bipyramid - three of the fluorines are in a plane at 120° to each other; the other two are at right angles to this plane.
	www.chemguide.co.uk /atoms/bonding/shapes.html (2139 words)

	Chemistry 201 (Site not responding. Last check: 2007-11-07)
		Whenever we place four items equally around a central atom, they will assume tetrahedral geometry in order to be as far apart as possible.
		But, since one of the items is an electron pair, the remaining atoms are at the corners of a pyramid.
		But, you can't say that it is "trigonal" because trigonal planar and trigonal pyramidal are different geometries.
	www.science.siu.edu /chemistry/chem201/quiz10a.htm (277 words)

	Chemistry 321
		(a) tert -Butyl alcohol is an important reagent and solvent in organic chemistry.
		is an ion of particularly great theoretical importance in organic chemistry.
		Each of the seven carbon atoms has one hydrogen atom bonded it, and the molecule has a cyclic structure with a seven-membered ring.
	www.uwec.edu /lewisd/Chem321-0015/9905E1ans/9905e1ans1.htm (475 words)

	Mineralogy Notes (Site not responding. Last check: 2007-11-07)
		The science of mineralogy is the study of the physics and chemistry of natural, solid, crystalline materials.
		Therefore understand ing the physics and chemistry of the solid materials of the planet (mineralogy) is central to much of the Earth Sciences.
		Minerals are classified on their chemistry, particularly on the anionic element or polyanionic group of elements that occur in the mineral.
	ruby.colorado.edu /~smyth/G30101.html (4190 words)

	PHOSPHORUS CHEMISTRY: Chemistry
		INORGANIC CHEMISTRY: The inorganic chemistry of phosphorus mainly involves the study of variuos phosphates (pyro, cyclic and acyclic polymeric phosphates) and phosphides of variuos elements.
		ORGANIC CHEMISTRY: Phosphorus can form bonds readily with oxygen, nitrogen and sulfur; also it can form bonds with carbon much less readily; but the phosphorus-carbon bonds are inert that they do not break readily even though not very strong.
		The inorganic part is important when the bones and teeth are concerned and for the other biological functions the organic chemistry part is important.
	members.tripod.com /%7Echandrasekaran/chem.html (976 words)

	Silberberg/Chemistry: The Molecular Nature of Matter and Change (Site not responding. Last check: 2007-11-07)
		is square pyramidal, with the bromine below a plane formed by four of the fluorines (the last one is at the pyramid’s point.
		The following rule works almost all of the time: The central atoms of species (those deep in the interiors) are those that are found toward the center of the periodic chart, and toward the bottom.
		An ammonia molecule is described as a ‘tripod,’ or as a ‘trigonal pyramid,’ while an ammonium ion is named as a ‘tetrahedron.’ The nitrogen atom in both has an octet of electrons, distributed as four pairs avoiding the other pairs in 3-dimensional space by being tetrahedrally arranged.
	www.mhhe.com /physsci/chemistry/silberberg/student/olc/super10.mhtml (242 words)

	Functional group geometry
		For organic molecules, we will observe the same types of geometry - linear, trigonal planar, tetrahedral, trigonal pyramid, and bent.
		When a molecule consists of many atoms, each carbon, oxygen, or nitrogen atom may be the center of the one of the geometries previously listed.
		This is BENT and also flat as an extension of the trigonal planar geometry.
	www.elmhurst.edu /~chm/vchembook/522funcgpCqz.html (312 words)

	MSD - entry 2aza
		The rack-induced bonding mechanism of metals to proteins is a useful concept for explaining the generation of metal sites in electron transfer proteins, such as the blue copper proteins, that are designed for rapid electron transfer.
		The trigonal pyramidal structure imposed by the protein with three strong equatorial ligands (one Cys and two His) provides a favorable geometry for both cuprous and cupric oxidation states.
		These crystal structures demonstrate that blue copper proteins are flexible enough to permit a range of movement of the Cu atom along the axial direction of the trigonal pyramid.
	www.ebi.ac.uk /msd-srv/msdlite/atlas/2aza_citation.html (1677 words)

	Shapes of molecules and bond angles at Doc Brown's Chemistry Clinic. Electron pair repulsion theory learn learning ... (Site not responding. Last check: 2007-11-07)
		Shapes of molecules and bond angles at Doc Brown's Chemistry Clinic.
		All the bonds shown are dative covalent, with lone pair donation by the ligand L, to the central metal ion i.e.
		Most bond angles in organic chemistry can be accurately or approximately predicted using bond repulsion theory (with some notable exceptions at the end).
	2fwww.wpbschoolhouse.btinternet.co.uk /page06/molecule_shapes.htm (1107 words)

	A STUDY OF THE Li \|Li$_X$V$_2$O$_4$ ELEMENT (Site not responding. Last check: 2007-11-07)
		There has been much interest in the last two decades in layered vanadium oxides and their intercalates because of their potential use as secondary cathode materials for advanced lithium batteries.
		The structure of these frameworks is defined in substantial part by the coordination polyhedra of the vanadium, which vary from tetrahedron, trigonal pyramid, square pyramid, distorted octahedron, and rectilinear octahedron, while oxidation state changes from +5 to +3.
		However, general principles of structural classification for all vanadium oxide frameworks are also given and consist of two levels.
	imr.chem.binghamton.edu /zavalij/papers/MRS98_Boston_1.htm (279 words)

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