Search results
Results From The WOW.Com Content Network
The possible products include SiH 4 and/or higher molecules in the homologous series Si n H 2n+2, a polymeric silicon hydride, or a silicic acid. Hence, M II Si with their zigzag chains of Si 2− anions (containing two lone pairs of electrons on each Si anion that can accept protons) yield the polymeric hydride (SiH 2) x.
Valence shell electron pair repulsion (VSEPR) theory (/ ˈ v ɛ s p ər, v ə ˈ s ɛ p ər / VESP-ər, [1]: 410 və-SEP-ər [2]) is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. [3]
In the natural bond orbital viewpoint of 3c–4e bonding, the triiodide anion is constructed from the combination of the diiodine (I 2) σ molecular orbitals and an iodide (I −) lone pair. The I − lone pair acts as a 2-electron donor, while the I 2 σ* antibonding orbital acts as a 2-electron acceptor. [12]
n. They feature Si-Si bonds. Attracting more interest are the organic derivatives such as polydimethylsilane ((CH 3) 2 Si) n. Dodecamethylcyclohexasilane ((CH 3) 2 Si) 6 is an oligomer of such materials. Formally speaking, polysilanes also include compounds of the type (SiH 2)n, but these less studied. Carbosilanes are polymeric silanes with ...
This shape is found when there are four bonds all on one central atom, with no extra unshared electron pairs. In accordance with the VSEPR (valence-shell electron pair repulsion theory), the bond angles between the electron bonds are arccos(− 1 / 3 ) = 109.47°. For example, methane (CH 4) is a tetrahedral molecule.
Gilbert N. Lewis introduced the concepts of both the electron pair and the covalent bond in a landmark paper he published in 1916. [1] [2] MO diagrams depicting covalent (left) and polar covalent (right) bonding in a diatomic molecule. In both cases a bond is created by the formation of an electron pair.
In chemistry, the trigonal prismatic molecular geometry describes the shape of compounds where six atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a triangular prism. The structure commonly occurs for d 0, d 1 and d 2 transition metal complexes with covalently-bound ligands and small charge ...
6/n "[AlBr] n" → Al 2 Br 6 + 4 Al. This reaction is reversed at temperatures higher than 1000 °C. Aluminium monobromide has been crystallographically characterized in the form the tetrameric adduct Al 4 Br 4 (NEt 3) 4 (Et = C 2 H 5). This species is electronically related to cyclobutane.