Constructing and deciphering Molecular Orbital

• ultranova3

  26 Oct 07, 00:02

  Does anyone know how to construct MO for F2O and AlCl3?
  Any good reference to get all the molecules' symmetries and point groups?
  
  I hate doing MO.
  thank you
• unclebutcher

  26 Oct 07, 01:11

  is it spdf notation? or issit more cheem than that.
• ultranova3

  26 Oct 07, 01:57

  Originally posted by unclebutcher:

  is it spdf notation? or issit more cheem than that.

  not spdf notation. spdf is for atomic orbital. interaction between 2 or more atomic orbitals will give MO.
  
• kenshin_himura

  26 Oct 07, 02:12

  ALCL3 is considered triangular planar shape right, considering it is more fo a covalent substance since AL is grp 3 transitional element and F is very electro negative. Damn NS has made me stupid.
  
  F2O, i think it is the shape will be like H2O, a triangular pyramidal with the lone pair electrons one ontop and the other at one of the corner of the triangular base. but F2O will have a smaller angle between the 2 F moleculse as the electrons are pulled more towards the 2 F atoms.
  
  
• unclebutcher

  26 Oct 07, 10:29

  i only know that f2o has 2 lone pairs and 2 bond pairs, which makes it bent & 105 degrees, alcl3 is trigonal planar, 120 degrees
• ultranova3

  27 Oct 07, 03:40

  That is VSEPR shape. still need to find symmetry and point group. I always get dizzy doing symmetry cause I have to keep visualizing 3 D of the molecules - mirror planes, axis of rotation, point of inversion etc.
  And i always get it wrong. If I cannot get the symmetry right, the whole point groups and Molecular orbitals will be wrong.