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![[Post New]](/templates/default/images/icon_minipost_new.gif) 19 Feb 2008 13:17:32 IST
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1) In NCERT chemistry (class 12,part 1 , pg 250) it says that ..........when ligands approach the metal ion the degenerate d orbitals get split up . And the dx2-y2 and dz2 orbitals experience more repulsions from approaching ligand(since they are along the axes) than dxy,dyx,dzx orbitals(not along axes) and so dx2-y2 and dz2 orbitals are raised above from barycenter and dxy,dyx,dzx are pushed down from barycenter.... but my doubt is dxy,dyx,dzx orbitals do experience some repulsions from ligand so why are they not raised in energy from barycenter line like the dx2-y2 and dz2 orbitals (rise in the energy could be low but there should be some energy rise)
2)The figure on pg 245 of ncert......in fig 9.6....the two enantiomers shown seem to be super imposable then why that compound [Co(en)3]3+ is showing optical isomerism???
3)In diag 9.7 on the same page(245) how is the second molecule mirror image of first......
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19 Feb 2008 20:27:09 IST
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nice doubt as to question one. both the set of orbitals are only higher than the actual energy they should have been possessing. actualy baricentre is the mean energy(average) of the energies of the two set of orbitals. If you closly look at it then you will find that the energies are in delta . it means t2g are possessing 2\5 delta less than the mean energies.(denoted by the negative sign) ands eg possess 3\5 more than the mean energy
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19 Feb 2008 21:28:09 IST
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For 1st que....
firstly when the dxy,dyx,dzx orbitals are not oriented along the direction of approach of the ligand but rather dx2-y2,dz2 orbitals are oriented along the direction of approach of ligand so.......the latter ones gain some energy from the former ones......which gives rise to their rise in energy level......and consequently the former ones drop down in the energy level.....
FOR QUES 2 and 3.........
the diagrams are made in 2-D and the geometry is in 3-D
(octahedral).....just try to imagine in 3-D....you may understand the difference........
hope it helps........
Cheeerrsss!!!!!
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
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19 Feb 2008 23:49:39 IST
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thanx a lot aatish and piit.jak...........but the third question is still not clear to me
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
"It's better to have a gun and not need it than to need a gun and
not have it."
--- The Sniper
"You can get more with a kind word and a gun than you can with a
kind word. "
--- The Sniper
"Join the Army: travel to exotic distant lands; meet exciting,
unusual people and kill them. "
--- The Sniper
"The victor will never be asked if he told the truth."
--- Adolf Hitler
"Stop talking, start doing"
--- IBM
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20 Feb 2008 00:04:49 IST
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I told you know for that you have to visualize it........
it cannot be explained here try it yourself.......
take the help of some pens...try to make an octahedral geometry with that....it may require help of some volunteers.....but if done properly then it will clear all your doubts.......
Cheers!!!!!!!!
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
............................................................................................................................................................................................
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20 Feb 2008 00:08:30 IST
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the second molecule in ques is in trans form but we know that enantiomers occur only if the molecule is in cis form(its written somewhere above in that page only)
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
"It's better to have a gun and not need it than to need a gun and
not have it."
--- The Sniper
"You can get more with a kind word and a gun than you can with a
kind word. "
--- The Sniper
"Join the Army: travel to exotic distant lands; meet exciting,
unusual people and kill them. "
--- The Sniper
"The victor will never be asked if he told the truth."
--- Adolf Hitler
"Stop talking, start doing"
--- IBM
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21 Feb 2008 20:07:23 IST
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yeah..........i m sorry.........u r right..........
that third one must be wrong.........
I referred two-three more books........its wrong there........
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
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21 Feb 2008 21:19:09 IST
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I think this should be corrected in NCERT
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
............................................................................................................................................................................................
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21 Feb 2008 21:21:57 IST
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Re:The Sniper needs a little help:Regarding splitting of degenerate d orbitals in crystal
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
............................................................................................................................................................................................
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21 Feb 2008 21:26:16 IST
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Really appreciable efforts Aatish , thanx a lot man
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" The difficult we do immediately, impossible takes a little longer "
--- U.S. Army
"It's better to have a gun and not need it than to need a gun and
not have it."
--- The Sniper
"You can get more with a kind word and a gun than you can with a
kind word. "
--- The Sniper
"Join the Army: travel to exotic distant lands; meet exciting,
unusual people and kill them. "
--- The Sniper
"The victor will never be asked if he told the truth."
--- Adolf Hitler
"Stop talking, start doing"
--- IBM
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