Examples of sigma (σ) – donors:
Related Questions;
Sunday, November 29, 2020
What are pi-acceptors ligands give the examples?
Examples of pi-acceptors ligands given as;
Related Questions;
(1) What type of ligands are known ?
(3) What is the common formula of “Prussian blue is” and “Turn bull's blue”?
(4) What is denticity of NO and NO+ ligands ?
(5) Why all the tetrahedral Complexes are high spin Complexes?
(6) Why Fe(CO)5 is colourless while Fe(bipy)(CO)3 is intensely purple in colour ?
(7) Why [Mn(H2O)6]+2 is colourless although in which Mn+2 ion had five unpaired electrons ?
(8) Why [FeF6]3– is colourless whereas [CoF6]3– is coloured?
(9) Why [Ni(CN)4]-2 is colourless while [Ni(H2O)4]-2 is colour although both have +2 oxidation state and 3d8 configuration ?
What are pi-donors ligands give the examples?
Ligands such as OR−, F−, and Cl− are π donors as a result of the lone pairs that are left after one lone pair has formed the M−L σ bond. Instead of stabilizing the dπ electrons of a d6 ion as does a π acceptor, these electrons are now destabilized by what is effectively a repulsion between two filled orbitals.
Examples of pi-donor ligands given as;
Related Questions;
(1) What type of ligands are known ?
(2) What is the common formula of “Prussian blue is” and “Turn bull's
blue”?
(3) What is denticity of NO and NO+ ligands ?
(5)Which of the Complex of the following pairs has the highest value of CFSE?
(6) Colour of Complexes due to charge transfer:
(7) Why violet colour of [Ti(H2O)6]Cl3 disapear (colourless) on heating heating ?
(9) Why [FeF6]3– is colourless whereas [CoF6]3– is coloured ?
(10) Why Fe(CO)5 is
colourless while Fe(bipy)(CO)3 is intensely purple in colour ?
Why all the
tetrahedral Complexes are high spin Complexes ?
What type of ligands are known ?
Many ligands are a combination of donor types, but the “pure” donor diagrams can be considered as;
Related Questions;
(1) What are pi-donors ligands give the examples?
Saturday, November 28, 2020
What are the inverse spinel structures?
INVERSE SPINEL STRUCTURE (Fe3O4-Magnetite):
In Fe3O4, Fe+2 and Fe+3 ions are present in the ratio 2:1. it may be considered as having composition FeO.Fe2O3. In Fe3O4 Oxide arranged in ccp. Fe+2 ions occupy octahedral voids while Fe+3 ions are equally distributed between octahedral and tetrahedral voids
MgFe2O4 also has structure similar to magnetite. In this Mg+2 ions are present in place of Fe+2 ion in Fe3O4. Magnetite has inverse spinet structure.
Related questions;
What are the normal spinel structures?
NORMAL SPINEL (AB2O4 )
STRUCTURE:
Example of Spinel is a MgAl2O4.( mineral) In it oxide ions (O-2) are arranged in ccp with Mg+2 ions occupying tetrahedral voids and Al+3 ions in a set of octahedral voids.
Many ferrites (such as ZnFe2O4) also possess spinel structure. These are very
important magnetic materials and are used in telephone and memory loops in
computers.
Friday, November 27, 2020
Law of Isomorphism
When two or more compound forms similar type of crystals or able to form mixed crystals, they are known as isomorphs. For examples:MgSO4.7H2O, ZnSO4.7H2O and FeSO4.7H2Oare isomorphs of each other as their crystals posses same shape.
According to Mitscherlich [year 1819]. The valency of elements that are similarly placed to that of other elements in their isomorphs are always same.
In the above example Fe, Zn and Mg have same valency [2] and equal ratio of water molecule in each isomorphs.
If equivalent mass of one element is known then atomic mass can be calculated by knowing the valency of other isomorphs key element.
ILLUSTRATIVE EXAMPLE(4): Which pair of the following substances is said to be isomorphous?
(A) White vitriol and blue vitriol
(B) Epsom salt and Glauber's salt
(C) Blue vitriol and Glauber's salt
(D) White vitriol and Epsom salt
SOLUTION:
Epsom salt (MgSO4.7H2O) and White vitriol
(ZnSO4.7H2O) contains divalent cation
Mg2+ and Zn2+ and same number of
water molecules as water of crystallization
which hold criteria for isomorphism. Hence (D) is correct.
Friday, November 20, 2020
What are the chemical formula and chemical name of Red Vitriol?
The chemical formula of Red Vitriol is CoSO4.xH2O (x=7) and chemical name is Cobalt sulphate.
Related Questions;
What are the chemical formula and chemical name of "Mohar's Salt" ?
When saturated solutions of ferrous sulphate and al Ammonium sulphate are mixed and the solution is evaporated, we get the well known compound, Mohr’s salt.
What are the chemical formula and chemical name of Glauber salt ?
The chemical formula of Glauber salt is (Na2SO4·10H2O) and chemical name is hydrated sodium sulphate. it a colorless crystalline salt used in dyeing, as a cathartic, and in solar energy systems.
Related Questions;
What are the chemical formula and chemical name of Epsom ?
The chemical formula of Epsom is MgSO4.xH2O (x=7) and chemical name is Magnesium sulphate.
Related Questions;
What are the chemical formula and chemical name of Plaster of paris ?
The chemical formula of Plaster of paris is CaSO4.xH2O (x=1/2) and chemical name is Calcium sulphate hemihydrate.
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