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Inorganic Chemistry

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4 Feb 2007 04:07:26 IST

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transition metals

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Both Ni(CO)4 & Ni(CN)42- have same no of electrons whereas one is diamagnetic while other is paramagnetic.Explain.

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tina

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Joined: 31 Jan 2007

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5 Feb 2007 00:14:53 IST

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Hello

Your question seems to be incorrect.As far as I know both the complexes show diamagnetic behaviour.

The diamagnetic behaviour of a complex compound is due to paired e's while paramagnetic behaviour is due to the pressence of unpaired e's.In case of

Ni(CO)4 Ni is in 0 oxidation state & has G.S conf. of 3d84s2 it therefore has 2 unpaired e's in d shell .CO being a strong ligand field compels the 2 s e's to pair up with the 2 unpaired d e'sHnce aal the e's in d shell r paired & therefore shows diamagnetic behaviour In Ni(CN)42- Ni is in +2 o.s (Ni+2) & has gs cnf. of 3d8 here (CN) is a strong ligand field and it also pairs up the 3d electrons togather resulting in the diamagnetic behaviour of the complex.

However, Ni(CO)4 has a tetrahedral geometry due to sp3 hybd & Ni(CN)4 2- has square planar geometry due to dsp2 hydb.

rajneesh

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5 Feb 2007 11:18:06 IST

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both are dimagnetic with all paired electrons . I have mis-calculated .thanks for your suggestion TINA.

tina

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5 Feb 2007 14:23:20 IST

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Hello rajneesh

Are u sure about the ans u wrote , which book did u refer.I ve checked the ans i wrote with the books I refer & I still get the same ans. ie; both Ni(CO)4 & Ni(CN)42- r diamagnetic Can u pls refer back & ans me

thanks

sanorita_4u12

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6 Feb 2007 02:30:40 IST

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thanks for ur ans but this is a question from my university exam and i have reproduced the question as it appeared in that question paper.I am still looking to check whether the question was wrong or not,anyways thanks for ur effort.

arun-rashi

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7 Feb 2007 08:42:13 IST

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this is all based on ligend power ,very simple if there is strong ligend like CO,CN-,en,ALL FORMS INNER ORBITAL COMPLEX SO PAIRING OF ELECTRON TAKES PLACE so these are diamegnetic and colouress while in case of weak ligend like H2O,OH -,HALOGEN all forms outer orbital complex if there is unpaired electron they remains and coloured .for example fe[CN]6 power -3 is d2sp3 while fe[Cl]power -3 is sp3d2

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