Covalent multinuclear bonds are found in the solid state structures of :
MeLi
A multinuclear (multicentre) bond is one in which a single electron pair is shared over more than two atoms. Such bonding appears when a molecule is electron deficient — it has fewer valence electrons than are needed to form ordinary two-centre two-electron bonds to all its neighbours.
MeLi is the answer. In the solid it does not exist as discrete Li-CH3 units but as a tetramer, (MeLi)4, built on a Li4 tetrahedron with a methyl group capping each face. Each methyl carbon is bonded simultaneously to three lithium atoms, so the bonding electrons are spread over four centres in a four-centre two-electron arrangement. Lithium simply does not have enough valence electrons to bond each methyl conventionally, so it compensates by aggregating — which is also why methyllithium is soluble in hydrocarbons and ethers rather than being a salt.
HgMe2 is a simple linear, monomeric molecule with two ordinary two-centre Hg-C bonds. Mercury(II) is electron rich enough not to aggregate.
WMe6 is a discrete molecular hexamethyl complex, notable for its distorted trigonal-prismatic rather than octahedral geometry, but its W-C bonds are conventional two-centre bonds.
PbMe4 is a tetrahedral molecule with four normal Pb-C single bonds — the same bonding pattern as neopentane, and the reason it was volatile enough to be used as a petrol additive.
Hence covalent multinuclear bonding is found in MeLi.
Similar Questions
The species that contain a vacant d x2 - y2 orbital is :
The solutions of
(i) [Cr(OH2)6]3+ ions are pale blue-green, but the chromite ion
(ii) [CrO4]2- is an intense yellow due to :
The major product of the following reaction in :
FeCl2 . 4H2O and FeCl3 . 6H2O can be distinguished by 57Fe Mössbauer spectroscopy. The INCORRECT statement from the following is :
The oxyacids of sulphur having direct S-S bonds are :
The point group of Cis - [PtCl2(NH3)2] is :
The structures of tetrasulphur tetranitride (a) and tetrathiazyl tetrafluoride (b) are given below. The statement that correctly describes the structures is :
Between NF3 and NH3 :
In an axially symmetric field, the first NQR transition energy for I = $\frac{3}{2}$ is :
Alkali metals form strong complexes with cryptate ligands. The structure of one such crypt given below is of :
Important Questions from Structure of Atom
- According to Bohr's model, electromagnetic radiations possess dual character properties behaving like:
- Which of the following is NOT an isotope of hydrogen atom?
- The atomic number of an element is equal to which of the following?
- Which of the following factors primarily determines the size of an atom?
- The atomic radius of hydrogen atom is
