UV-Visible spectroscopy
, Principle
UV-Visible (UV=200-400nm ,visible=400-800nm) corresponds to electronic excitation
between the energy levels that correspond to the molecular orbitals of the systems.In
particular transitions involving ∏ orbitals and lone pairs (n-non bonding are importan
so uv-visible spectroscopy is of most useful for identifying conjugated systems.)
•
• Types of electronic transitions
• Three types of electrons are involved in electronic transitions.These ae σ
electrons and non bonding n electrons .
• Absorption of uv and visible light by organic compounds will cause the p
of electrons in the σ and ∏ n bonding orbitals to σ* and ∏* orbitals in
excited state.
, Principle
UV-Visible (UV=200-400nm ,visible=400-800nm) corresponds to electronic excitation
between the energy levels that correspond to the molecular orbitals of the systems.In
particular transitions involving ∏ orbitals and lone pairs (n-non bonding are importan
so uv-visible spectroscopy is of most useful for identifying conjugated systems.)
•
• Types of electronic transitions
• Three types of electrons are involved in electronic transitions.These ae σ
electrons and non bonding n electrons .
• Absorption of uv and visible light by organic compounds will cause the p
of electrons in the σ and ∏ n bonding orbitals to σ* and ∏* orbitals in
excited state.
