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Which of the following statement(s) is/are true about the transition metal- alkene complexes?
- a)Back- bonding weakens the double bond of the alkene
- b)σ- Bonding and back- bonding synergistically strengthen metal- alkene interaction
- c)Electron- withdrawing substituents on alkene reduce back- bonding
- d)π- Acidic co- ligands on metal strengthen back- bonding
Correct answer is option 'A,B'. Can you explain this answer?
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Which of the following statement(s) is/are true about the transition m...
Transition Metal-Alkene Complexes: True Statements
A) Back-bonding weakens the double bond of the alkene.
B) Bonding and back-bonding synergistically strengthen metal-alkene interaction.
Explanation:
Transition metal-alkene complexes are formed when an alkene molecule coordinates with a transition metal ion through the pi-electrons of the double bond. In this coordination, the alkene molecule acts as a pi-donor and the metal ion acts as a pi-acceptor. This leads to the formation of a sigma-bond between the metal and one of the carbon atoms of the alkene, and a pi-bond between the metal and the other carbon atom of the alkene. These metal-alkene interactions can be strengthened or weakened by various factors such as the electronic properties of the metal ion, the nature of the alkene molecule, and the presence of other ligands.
A) Back-bonding weakens the double bond of the alkene: Back-bonding is the donation of electrons from the metal to the antibonding orbital of the alkene. This weakens the double bond of the alkene as the antibonding orbital is destabilized. This can lead to a decrease in the reactivity of the alkene towards electrophiles and a decrease in the bond length of the double bond.
B) Bonding and back-bonding synergistically strengthen metal-alkene interaction: Bonding is the donation of electrons from the alkene to the metal ion. This leads to the formation of a sigma-bond between the metal and the alkene. Back-bonding is the donation of electrons from the metal to the antibonding orbital of the alkene. This leads to the formation of a pi-bond between the metal and the alkene. The sigma-bond and the pi-bond together strengthen the metal-alkene interaction. This phenomenon is known as synergistic bonding.
C) Electron-withdrawing substituents on alkene reduce back-bonding: Electron-withdrawing substituents on the alkene molecule decrease the electron density on the alkene double bond. This reduces the overlap between the pi-orbitals of the alkene and the metal ion, leading to a decrease in back-bonding.
D) Acidic co-ligands on metal strengthen back-bonding: Acidic co-ligands on the metal ion increase the electron density on the metal ion. This leads to an increase in the overlap between the pi-orbitals of the alkene and the metal ion, leading to an increase in back-bonding.
A) Back-bonding weakens the double bond of the alkene.
B) Bonding and back-bonding synergistically strengthen metal-alkene interaction.
Explanation:
Transition metal-alkene complexes are formed when an alkene molecule coordinates with a transition metal ion through the pi-electrons of the double bond. In this coordination, the alkene molecule acts as a pi-donor and the metal ion acts as a pi-acceptor. This leads to the formation of a sigma-bond between the metal and one of the carbon atoms of the alkene, and a pi-bond between the metal and the other carbon atom of the alkene. These metal-alkene interactions can be strengthened or weakened by various factors such as the electronic properties of the metal ion, the nature of the alkene molecule, and the presence of other ligands.
A) Back-bonding weakens the double bond of the alkene: Back-bonding is the donation of electrons from the metal to the antibonding orbital of the alkene. This weakens the double bond of the alkene as the antibonding orbital is destabilized. This can lead to a decrease in the reactivity of the alkene towards electrophiles and a decrease in the bond length of the double bond.
B) Bonding and back-bonding synergistically strengthen metal-alkene interaction: Bonding is the donation of electrons from the alkene to the metal ion. This leads to the formation of a sigma-bond between the metal and the alkene. Back-bonding is the donation of electrons from the metal to the antibonding orbital of the alkene. This leads to the formation of a pi-bond between the metal and the alkene. The sigma-bond and the pi-bond together strengthen the metal-alkene interaction. This phenomenon is known as synergistic bonding.
C) Electron-withdrawing substituents on alkene reduce back-bonding: Electron-withdrawing substituents on the alkene molecule decrease the electron density on the alkene double bond. This reduces the overlap between the pi-orbitals of the alkene and the metal ion, leading to a decrease in back-bonding.
D) Acidic co-ligands on metal strengthen back-bonding: Acidic co-ligands on the metal ion increase the electron density on the metal ion. This leads to an increase in the overlap between the pi-orbitals of the alkene and the metal ion, leading to an increase in back-bonding.
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Which of the following statement(s) is/are true about the transition metal- alkene complexes?a)Back- bonding weakens the double bond of the alkeneb)σ- Bonding and back- bonding synergistically strengthen metal- alkene interactionc)Electron- withdrawing substituents on alkene reduce back- bondingd)π- Acidic co- ligands on metal strengthen back- bondingCorrect answer is option 'A,B'. Can you explain this answer?
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