What is the structure and structural characteristic of dichromate kon (Cr2O7)-2?

The whole molecule dichromate ion (Cr₂O₇)-2 is non planer and polar and oxygen atom of (Cr-O-Cr) oxy-linkage does not involve in delocalization due to maximum repulsion hence two Cr-O bond have equal length and bond order may be/equal to one while other six Cr=O bond have eqaual bond length.

In dichlorine heptaoxide (Cr₂O₇)-2 , two (CrO₄ )-2 group connected with an oxygen atom which is sp3 hybridised (non planer) and bond angle may be expected 109⦁28’ but actually due to the presence of two lone pair on oxygen atom the Cr-O-Cr bond angle deviated from ideal and it may be greater (119⦁) than ideal bond angle.

What is the structure and structural characteristic of dichlorine heptaoxide (Cl2O7)-2?

Related Questions:

Classification of oxides on basis of oxygen content:

(1) Normal Oxides:

(2) Sesqui Oxides:

(3) Mixed Oxides:

(4) Peroxides:

(5) Super Oxides:

(6) Suboxides:

(7) Perovskites:

(8) Spinel Oxides:

(9) Cage like Oxide:

Others oxides

(1) Crystal lattice Structure of Oxides:

(2) Corundum (Al2O3) type Structure:

(3) What are the normal spinel structures?

(4) What are the inverse spinel structures?

(5) Rutile (TiO2) type Structure:

(6) Pervoskite (ABO3) type structure:

14th Group: Carbon Family:

(A) Silicon compounds:

(1) Silicon and Its Compounds:

(2) Silicon Oxide : Silica (SiO2):

(3) Silicon Carbide(SiC): Carborundum:

(4) Silicates (SiO4)-4: salts of silicic acids:

(5) Silicones:(R2SiO with-Si-O-Si- Linkage):

Illustrative Examples:

(1) Why are the properties of CO2 and SiO2 different?

(2) Why does SiCl4 undergo hydrolysis whereas CCl4 doesn't?

(3) What are most common cyclic meta silicates?

(5) What are the Silicones? Give one example one cyclic Silicone?

(6) What are the hydrolysis products of urea ?

(7) Why CO2 is a gas, but SiO2 is a high melting solid?.

(8) Arrange the silicon halides into decreasing order of Lewis acids Character? SiF4, SiCl4, SiBr4, SiI4

(10) CCl4 can not be hydrolysed but SiCl4 can be. Why?

(11) Silianol (SiH3OH) is more acidic than methanol (CH3OH) why?

(B) Carbon Allotropes and compounds:

(1) Structure of Diamond:

(2) Structure of Graphite:

(3) Structure of Fullerences:

Illustrative Examples:

(1) What happened when Graphite treated concentrated acids like HNO3/HF or KMnO4 ?.

(2) Graphite is considere, thermodynamically the most stable allotrope of carbon why ?

(3) Why the C-C bond length in graphite is shorter than C-C bond length of diamond?

(4) All the carbon atom of fullerenes (C60) are equivalent but all C-C bond are not equivalent why ?

(5) Is all the C-C bond length in fullerene is equal ?

(6) How many six membered ( hexagons) and five membered (Pentagons) carbon ring present in (C60) fullerene ?.

(7) Buckminsterfullerene: Bucky Balls: Allotrope of Carbon:

(8) How to prepared Carbon Suboxide (C3O2) ?

Compare the splitting energy (∆●) into the following compound and give appropritate reason ?

Given compounds are...

(A) [Co(NH3)6]3+ 

(B) [Rh(NH3)6]3+

(C) [Ir(NH3)6]3+

Solution :

In given compounds number of ligands, types of ligands and oxidation state is same for central atom belongs to same group but different transition series 3d, 4d and 5d respectively. We know that as move top to bottom size of d-orbital(3d--> 4d --> 5d) is increases so ligand approches to d-orbitals more closely so the repulsion

between d-orbital of metal and ligand is high and splitting energy increases.order of splitting energy [Co(NH3)6]3+ < [Rh(NH3)6]3 <[Ir(NH3)6]3+

Related Questions:

(1) What are bridging ligands and how to show bridging ligands in naming, explain with suitable example.

(2) [Fe(CN)6]3- is weakly paramagnetic while [Fe(CN)6]4- is diamagnetic, why ?

(3) [Fe(CN)6]4- is diamagentic while [FeF6]4- is strongly paramagnetic.Why ?

(4) Which of the Complex of the following pairs has the largest value of CFSE?

(5) Compare the splitting energy (CFSE) into the following compound and give appropritate reason ? [Co(NH3) 6] 3+ , [Rh(NH3) 6] 3+,[Ir(NH3) 6] 3+

(6) Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually [Fe(CN)6]3 is more stable than [Fe(CN)6]4- ?

(7) Which complex is more stable [Ni(CN)4]4- or [Ni(CN)4]2- and why?

(8) Why violet colour of [Ti(H2O)6]Cl3 disapear (colourless) on heating heating ? 

(9) Why [Ni(CN)4]-2 is colourless while [Ni(H2O)4]-2 although both have +2 oxidation state and 3d*8 configuration ?

(10) Why [FeF6]3– is colourless whereas [CoF6]3– is coloured ? 

(11) Why Fe(CO)5 is colourless while Fe(bipy)(CO)3 is intensely purple in colour ?

(12) Why all the tetrahedral Complexes are high spin Complexes ?

Explain the formation of Na4[Fe(CN)6] and Na4[FeF6] ? Show which is low spin and which is high spin complex and also calculate the Crystal field stablisation energy (CFSE) ?

In the given compounds CN– is strong field ligands and F– is weak field ligand and in both compounds ions is in +2 oxidation state d6 configuration.

Related Questions;

(1) What type of ligands are known ?

(2) What are pi-donors ligands give the examples?

(3) What are pi-acceptors ligands give the examples?

(4) What are the chemical formula and chemical name of Glauber salt ?

(5) What are the chemical formula and chemical name of Epsom ?

(6) What are the chemical formula and chemical name of Gypsom ?

(7) What are the chemical formula and chemical name of Plaster of paris ?

(8) What are the chemical formula and chemical name of White Vitriol?

(9) What are the chemical formula and chemical name of Green Vitriol?

(10) What are the chemical formula and chemical name of Blue Vitriol?

What are bridging ligands and how to show bridging ligands in naming, explain with suitable example.

(A) If a complex ion has two or more than two metal atoms then it is termed polynuclear. The ligand which connects the two metal ions is called as Bridging ligand or Bridge group.

(B) A prefix of Greek letter (U) , is repeated before the name of each different kind of bridging group.

Related questions:

(1) Which complex is more stable [Ni(CN)4]4- or [Ni(CN)4]2- and why?

(2) d3s Hybrization and it's examples.

(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 ?