We often see electronic states are named like nπ* or ππ* states. What is the reason behind this kind of naming ?

  • $\begingroup$ Hello and welcome to Chemistry.SE! At this point I suggest that you take the short tour of the site. Best of luck... $\endgroup$ – airhuff Feb 19 '17 at 4:35
  • $\begingroup$ Can you give specific examples? I'm not sure what your question is. $\endgroup$ – Avishai Barnoy Feb 19 '17 at 6:38
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    $\begingroup$ Are you sure you are not looking at the labels of electronic transitions? For example $\mathrm{n-\pi^*}$ would be the the transition of an electron from a nonbonding orbital to a $\pi$ antibonding orbital. $\endgroup$ – Ben Norris Feb 19 '17 at 11:27
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    $\begingroup$ As @Ben Norris writes the $\pi\pi^*$ refer to electronic transitions between states. The notation is just a simplification/shorthand to indicate the type of molecular orbitals the HOMO /LUMO electrons are in, rather than using proper symmetry labels. $\endgroup$ – porphyrin Feb 19 '17 at 11:59

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