Octahedral molecular structure
In chemistry, octahedral molecular geometry describes the shape of compounds wherein six atoms or groups of atoms or ligands are symmetrically arranged around a central atom, defining the vertices of an octahedron. The octahedron has eight faces, hence the prefix octa. The octahedron is one of the Platonic solids, although octahedral molecules typically have an atom in their centre and no bonds between the ligand atoms. A perfect octahedron belongs to the point group Oh. Examples of octahedral compounds are sulfur hexafluoride SF6 and molybdenum hexacarbonyl Mo(CO)6. The term "octahedral" is used somewhat loosely by chemists, focusing on the geometry of the bonds to the central atom and not considering differences among the ligands themselves. For example, [Co(NH3)6]3+, which is not octahedral in the mathematical sense due to the orientation of the N-H bonds, is referred to as octahedral.
The concept of octahedral coordination geometry was developed by Alfred Werner to explain the stoichiometries and isomerism in coordination compounds. His insight allowed chemists to rationalize the number of isomers of coordination compounds. Octahedral transition-metal complexes containing amines and simple anions are often referred to Werner-type complexes.

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Molecular Geometry
For bent molecular geometry when the electron-pair geometry is tetrahedral the bond angle is around 105 degrees. Lets consider the Lewis structure for CCl4.
intro.chem.okstate.edu/1314F00/Lecture/Chapter10/VSEPR.html
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Octahedral molecular geometry - Wikipedia, the free encyclopedia
Octahedral molecular geometry. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Idealized structure of a compound with octahedral ...
en.wikipedia.org/wiki/Octahedral_molecular_geometry
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Molecular geometry - Wikipedia, the free encyclopedia
A water molecule has two pairs of bonded electrons and two unshared lone pairs . Tetrahedral: Tetra- signifies four, ...
en.wikipedia.org/wiki/Molecular_geometry
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Tetrahedral molecular geometry - Wikipedia, the free encyclopedia
[edit source | edit]. The most common arrangement of liquid water molecules is tetrahedral with two hydrogen atoms covalently ...
en.wikipedia.org/wiki/Tetrahedral_molecular_geometry
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Shapes of Molecules
To understand any molecule, one must first complete a Lewis dot structure. It is then ... The four H atoms are arranged about the C atom in a tetrahedral shape .
www.chem.ufl.edu/~myers/chm2045/shapes.htm
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Molecular Geometry
Tetrahedral Molecular Geometries. The Lewis structure of methane, CH4, follows the rules for molecules with 8 valence electrons. It is shown below. There are ...
butane.chem.uiuc.edu/cyerkes/Chem102AEFa07/Lecture_Notes_102/newLecture%2014-102.htm
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Molecular Structure & Bonding
Since the tetrahedral, square-planar and square-pyramidal configurations have ... Different compounds having the same molecular formula are called isomers, ...
www2.chemistry.msu.edu/faculty/reusch/virttxtjml/intro3.htm
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Predicting Molecular Shapes - VSEPR - Library
Generic Formula: MX3 (where M is the central atom and X is are the bonding atoms). [Image]. TETRAHEDRAL - Bond angle = 109.5. Molecules with four atoms ...
library.thinkquest.org/C006669/data/Chem/bonding/shapes.html
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Molecular Geometry
Like part (b), it is a tetrahedral AB4 molecule. Si. H. H. H. H. (d) The Lewis structure of TeCl4 is shown below. There are four bonds and one lone pair which.
highered.mcgraw-hill.com/sites/dl/free/007255553x/135558/7_Molecular_Geometry_Ans.pdf
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Lewis Structures and the Shapes of Molecules - Angelo State ...
For molecules of the formula AXn, place the atom with the lower group number in the center. If A and X are in the ..... octahedral, square pyramidal, square planar.
www.angelo.edu/faculty/kboudrea/general/shapes/00_lewis.htm
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Octahedral molecular structure in science
Mainz scientists confirm original tetrahedral model of the molecular ...
Feb 12, 2013 ... Researchers at Johannes Gutenberg University Mainz (JGU) have confirmed the original model of the molecular structure of water and have ...
Scientists confirm original tetrahedral model of the molecular ...
Feb 12, 2013 ... Researchers at Johannes Gutenberg University Mainz (JGU) have ... confirm original tetrahedral model of the molecular structure of water.
Shapes of Molecules
To understand any molecule, one must first complete a Lewis dot structure. It is then ... The four H atoms are arranged about the C atom in a tetrahedral shape .
[PDF]Chapter 3 Molecular Shape and Structure The VSEPR Model
trigonal bipyramidal, octahedral, T-shaped, seesaw, square pyramidal, square planar. Representation of Molecules. • Molecular formula → Number and types of ...
Molecular Geometry
For bent molecular geometry when the electron-pair geometry is tetrahedral the bond angle ... Notice that there are two kinds of electron groups in this structure.
Molecular Structure & Bonding
Click on the university name to visit their site. ... Different compounds having the same molecular formula are called isomers, and the prevalence of organic ...
Molecular Geometry
Lewis structures can give us an approximate measure of molecular bonding. ... Six pairs of electrons separated in space will form an octahedron, with 90o ...
Shapes of Molecules - Angelo State University
Octahedral, 6, 0, AX6, octahedral, 90º ... the molecular polarity needs to be ...
VSEPR - Molecular Models
Valence Shell Electron Pair Repulsion theory (VSEPR) is a set of rules whereby the chemist may predict the shape of an isolated molecule. It is based on the ...
VSEPR theory - Wikipedia, the free encyclopedia
Where two or more resonance structures can depict a molecule, the VSEPR model is ... Likewise, for 4 electron pairs, the optimal arrangement is tetrahedral.
Books on the term Octahedral molecular structure
Advances in Molecular Structure Research
Advances in Molecular Structure Research
M. Hargittai, I. Hargittai, 1998
The crystal structure is unknown but most probably octahedrally coordinated Te is present as has been found in the known structure of orthotelluric acid consisting of octahedral Te(OI~I)6 molecules whereas tetrahedra are present in crystalline ...
Molecular Structure by Diffraction Methods
Molecular Structure by Diffraction Methods
L. E. Sutton, M. R. Truter, 1977
symmetry, but almost D3 symmetry experimentally.38 The octahedral Ga— S distances are 2.408 — 2.466 A. The ... to the water molecules. cw-Octahedral In02Cl4 co-ordination occurs in the structure of [InCl4- (H20)2][S4N3], with In— O  ...
Molecular Electronic-Structure Theory
Molecular Electronic-Structure Theory
Trygve Helgaker, Jeppe Olsen and Poul Jorgensen, 2013
Ab initio quantum chemistry has emerged as an important tool in chemical research and is applied to a wide variety of problems in chemistry and molecular physics. Recent developments of computational methods have enabled previously intractable chemical problems to be solved using rigorous quantum-mechanical methods.This is the first comprehensive u...
Symmetry and Structure: (Readable Group Theory for Chemists)
Symmetry and Structure: (Readable Group Theory for Chemists)
Sidney F. A. Kettle, 1995
The methods developed so far in this book will be exploited to the full in this chapter, where the electronic structure of the octahedral molecule SF6 will be considered in detail. This is quite a large molecule but its symmetry is also considerable; ...
HGS Molecular Structure Model Organic Chemistry Set
HGS Molecular Structure Model Organic Chemistry Set
Maruzen, 1988
Model Kit is in original packaging. There are approx. 3 of the white sticks missing, but it should not be a problem as there are plenty more to replace them. I'm missing the rubber piece which you don't need. Two of the black pieces have one clogged hole but this should not affect you. The model kit is in great condition otherwise and sho...
Rotational Structure in Molecular Infrared Spectra
Rotational Structure in Molecular Infrared Spectra
Carlo di Lauro, 2013
Carlo di Lauro. K,.(mol), with those of octahedral molecules like sulfur hexafluoride (0,, point group), and those of tetrahedral molecules like methane ( Td point group), see Herzberg, [11]. Table 4.6 Correlation of the Symmetry Species of the ...
Molecular Orbitals of Transition Metal Complexes
Molecular Orbitals of Transition Metal Complexes
This book starts with the most elementary ideas of molecular orbital theory and leads the reader progressively to an understanding of the electronic structure, geometry and, in some cases, reactivity of transition metal complexes. The qualitative orbital approach, based on simple notions such as symmetry, overlap and electronegativity, is the focus...
Molecular Structure and Statistical Thermodynamics: Selected ...
Molecular Structure and Statistical Thermodynamics: Selected ...
Kenneth Sanborn Pitzer, 1993
9, 1 November 1975 3862 K. S. Pitzer and L. S. Bernstein: Molecular structure ... When the lone pair is centered on an edge of the octahedron, it is closer to the ligands than in the face centered situation and farther than in the corner case, ...
Heterogeneous catalytic application of octahedral molecular sieves of manganese oxides - Oxidation, nitration,...
Heterogeneous catalytic application of octahedral molecular sieves of manganese oxides - Oxidation, nitration,...
Ranjit Kumar, 2011
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Blog posts on the term
Octahedral molecular structure
"Electronic and Magnetic Structure of Octahedral Molecular Sieves" by Aimee M Morey-Oppenheim
The major part of this research consists of magnetic and electronic studies of metal doped cryptomelane-type manganese oxide octahedral molecular sieves (KOMS-2). The second part of this study involves the magnetic characterization of cobalt doped MCM-41 before and after use in the synthesis of single walled carbon nanotubes.^ Manganese oxides have been used widely as bulk materials in catalysis, chemical sensors, and batteries due to the wide range of possible stable oxidation states. The catalytic function of manganese oxides is further tuned by doping the material with numerous transition metals. It is of particular interest the oxidation states of Mn present after doping. New titrations to determine the oxidation state of Mn were investigated. To further examine the structure of KOMS-2, the magnetic contribution of dopant metals was also examined. The KOMS-2 structure having both diamagnetic and paramagnetic metal ions substitutions was studied. ^ MCM-41 with the incorporation of cobalt into the structure was analyzed for its magnetic properties. The material undergoes significant structural change during the synthesis of single walled carbon nanotubes. It was the focus of this portion of the research to do a complete magnetic profile of both the before and after reaction material. ^
digitalcommons.uconn.edu/dissertations/AAI3492129/
Nanoscale etching of 3d fractal structures with many applications including 3d fractal antennas and structures for filters
]]> Email ThisBlogThis!Share to TwitterShare to Facebook TweetJournal of Micromechanics and Microengineering - Fabrication of 3D fractal structures using nanoscale anisotropic etching of single crystalline silicon When it comes to high-performance filtration, separation, sunlight collection, surface charge storage or catalysis, the effective surface area is what counts. Highly regular fractal structures seem to be the perfect candidates, but manufacturing can be quite cumbersome.
nextbigfuture.com/2013/06/nanoscale-etching-of-3d-fractal.html
Announcing the ChemDoodle API | iChemLabs, LLC.
Announcing the ChemDoodle API Posted in ChemDoodle API, Company. Written by iclkevin on July 29th, 2013 The ChemDoodle desktop application is used by thousands of institutions in over 70 countries.
www.ichemlabs.com/1708
The Lattice Compatibility Theory: Supports from the Generalized Simha-Somcynsky Chemical Physics-Related Theory
International Journal of Chemical Physics is a peer-reviewed, open access journal that publishes original research articles as well as review articles in all areas of chemical physics.
www.hindawi.com/journals/ijcp/2013/728040/
Electronic & Molecular Geometry | Janet Gray Coonce
Chemistry Tutorials
janetcoonce.com/2012/11/30/electronic-molecular-geometry/
Polymorphs of DABCO monohydrate as structural analogues of NaCl
scripts.iucr.org/cgi-bin/paper_yard?sf3127
Using Magnetic Toys, Researchers Tease Out Structures of Self-Assembled Moleculer Clusters | The Kavli Foundation
(Originally published by Harvard University) January 28, 2010 Scientists have long studied how atoms and molecules structure themselves into intricate clusters.
www.kavlifoundation.org/kavli-news/using-magnetic-toys-researchers-tease-out-structures-self-assembled-moleculer-clusters
CHEM-GUIDE: Prediction of molecular geometry on the basis of VSEPR and hybridization.
To use this theory for predicting the shapes of molecules, the number of electron pairs (both, shared and lone pairs) is simply counted. This is illustrated by taking a typical molecule of the type ABn.
chem-guide.blogspot.com/2010/04/prediction-of-molecular-geometry-on.html
Mr. B's Chemistry Help Site: Bonding and Structure
AP REVIEW: Bonding and StructureBonds form due to electrostatic attractions; negatively charged electrons of one atom are attracted to the positively charged nucleus of another atom. Atoms bond together to form molecules, and this is known as intramolecular bonding.
drbchemistry.blogspot.com/2008/06/bonding-and-structure.html
"Nanostructured Arrays of Semiconducting Octahedral Molecular Sieves by" by Anais E Espinal
This research work focused on developing new synthetic methods to produce thin films of mixed-valent octahedral molecular sieves with better control of their crystallographic orientation. This study paved the way to diverge from the lengthy liquid approaches that are currently being employed. The as-produced thin films show promising use in catalysis, sensors, and photovoltaics applications. Three different parts are included in this work. ^ The first part presents the novel formation of three-dimensional (3D) nanostructured arrays of cryptomelane-type manganese oxide (OMS-2) by heteroepitaxial growth on (001) single-crystal strontium titanate (STO) substrates. This study was done to prove the feasibility of producing thin films of microporous materials by pulsed laser deposition by means of self-assembly while preserving the crystallinity, porosity, and mixed-valency from target to film. The use of seeds or templates to direct the crystallization was avoided which increased scale-up and cost-effectiveness. ^ The second part of this research demonstrates a proof-of-concept of heteroepitaxial mechanisms of OMS-2 on other single-crystal strontium titanate substrates, such as (110)STO and (111)STO. This study proved that the crystal domains of OMS-2 can be directed in nanostructured arrays by selecting different orientations of single-crystal STO. Moreover, the electrical resistivity of the oriented OMS-2 thin films is well correlated with the direction of the tunnel and angle of the grain boundaries. These results promise applications in sensors and transistors. ^ The third part of this thesis involves the comprehensive characterization of OMS-2 materials. Characterization includes elemental chemical analysis in measurement of AOS and argon sorption studies in measurement of micropore distribution. The obtained information demonstrates that the K+ balances the mixed-valent octahedral framework (Mn4+ and Mn 3+) described by the cryptomelane-exchange. The sorption measurements with argon revealed a good correlation of the microporosity and surface area with potassium content. The understanding of the AOS and micro-structure of OMS-2 will facilitate the selection of specific OMS-2 materials for required applications. ^
digitalcommons.uconn.edu/dissertations/AAI3485234/
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