the combination of carbon and oxygen would result in four - center two - electron bond.
the combination of carbon and oxygen would result in four - center two - electron bond.
the combination of carbon and oxygen would result in what type of bond?
four - center two - electron bond
the carbon monoxide has a very high bond-dissociation energy, the strongest of any neutral molecule, 11.65 ev. carbon and oxygen together have a total of 10 electrons in the valence shell. following the octet rule for both carbon and oxygen, the two atoms form a triple bond, with six shared electrons in three bonding molecular orbitals, rather than the usual double bond found in organic carbonyl compounds. since four of the shared electrons come from the oxygen atom and only two from carbon, one bonding orbital is occupied by two electrons from oxygen, forming a dative or dipolar bond. this causes a c←o polarization of the molecule, with a small negative charge on carbon and a small positive charge on oxygen. the other two bonding orbitals are each occupied by one electron from carbon and one from oxygen, forming (polar) covalent bonds with a reverse c→o polarization, since oxygen is more electronegative than carbon. in the free carbon monoxide, a net negative charge δ remains at the carbon end and the molecule has a small dipole moment of 0.122 d.
carbon monoxide
hemoglobin contains four heme groups each capable of reversibly binding to one oxygen molecule. oxygen binding to any of these sites causes a conformational change in the protein, facilitating binding to each of the other sites. carbon monoxide binds to hemoglobin at the same sites as oxygen, but approximately 210 times more tightly. normally, oxygen would bind to hemoglobin in the lungs and be released in areas with low oxygen partial pressure (e.g. active muscles). when carbon monoxide binds to hemoglobin, it cannot be released as easily as oxygen. the slow release rate of carbon monoxide causes an accumulation of co-bound hemoglobin molecules as exposure to carbon monoxide continues. because of this, fewer hemoglobin particles are available to bind and deliver oxygen, thus causing the gradual suffocation associated with carbon monoxide poisoning.
carboxyhemoglobin