Structure of diborane

5 years ago

Share

Answers : (1)

                                        












Structure of diborane


In view of the trivalency of boron, we would expect it to from a simple hydride, BH3. However, H3 is not known. This is due to the fact that hydrogen atom in BH3 has no electron to from p?- p? back bonding. Thus back boron possesses incomplete octet and HN3 is dimerised to form B2H6 molecule with covalent and three centre bond. The simplest boron hydride is diborane, B2H6.


Electrons are required for the formation of conventional covalent bond structure whereas in diborane, three are only 12 valence electrons, three from each boron atoms. Thus B2H6 is an electron drficient compound. The geometry of B2H6 can therefore be explained as follows.


The four terminal hydrogen atoms and two boron atoms lie in one plane. Above and below this plane, there are two bridging hydrogen atoms. Each boron atom forms four bonds even though it has only three electrons. The terminal B-H bonds are regular bonds but the bridge B-H bonds are different. Each bridge hydrogen is bonded to the two boron atoms only by sharing of two electrons. Such covalent bond is called three centre electron pair bond or a multi centre bond or banana bond.


The positive charge on the two H nuclei suffers strong electrostatic repulsion due to close proximity of the bridged H atoms. In order to minimize this repulsion, the orbitals of bridged H atoms are bent away from each other in the middle.

5 years ago

Post Your Answer

More Questions On Inorganic Chemistry

Ask Experts

Have any Question? Ask Experts
Post Question
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details
pls provide me information on diff types of backbonding eg. ppi-ppi,ppi-dpi,dpi,ppi,,,,,etc
 
 
Pπ- Pπ bonding is called back bonding In BF3molecule the 2P orbitals of each F atom are fully filled, while one of 2Porbital of the B atom is vacant. The two 2P orbitals involved in...
  img
Sunil Kumar FP 2 months ago
expalin optical nisomerism and its types with neat and clean figure?
 
 
Stereomers are the compound having the same formula but they differ in configuration,the arrangement of atom in space.The two type of stereoisomer are:- (1)geometrical (2)optical OPTICAL...
  img
Sunil Kumar FP 26 days ago
is ncert level knowledge enough for doing competetion level inorgang chem. as it only requires learning by heart ( in aipmt or jee mains both have same level )
 
 
no my dear friend if you really want to have good command then you should read OPtandon inorganic chemistry along with NCERT.you can also try reading JDLEE but at the last.but optandon+NCERT...
  img
Sunil Kumar FP 2 months ago
it has been quite i while since my doubts havent been taken up. its my sincere request to please answer them asap.
 
 
Hai Can You please re post your doubts again to...
  img
Harishwar 17 days ago
Adsorption of hydrogen gas on glass is endothermic.explain
 
 
Adsorption is a phenomenon of attracting and retaining of an adsorbate substance on the surface of adsorbent resulting of higher concentration of adsorbate molecules on the surface....
  img
Aarti Gupta 29 days ago
100g of electrons calculate the moles
 
 
1 mole of electrons consists of 6.023*10^23 electrons Mass of 1 mole of electrons is 6.023*10^23 * 9.1*10^-28 grams so 6.023*10^23 * 9.1*10^-28 grams= 1 mole 100 grams = ??...
  img
Harishwar one month ago
View all Questions »