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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: NTUstudent on December 23, 2010, 08:10:37 AM

Title: intensity of colours
Post by: NTUstudent on December 23, 2010, 08:10:37 AM
hi guys,
i have question about complexes again.

Need to explain the following:
The colour of trans-[Co(en)2F2]+ is less intense than those of cis-[Co(en)2F2]+ and trans-[Co(en)2Cl2]+
Title: Re: intensity of colours
Post by: AWK on December 23, 2010, 10:08:39 AM
http://books.google.pl/books?id=2qAa5hp6KX4C&pg=PA278&lpg=PA278&dq=trans-%5BCo(en)2F2%5D%2B&source=bl&ots=ZaoRVJWHon&sig=5QGBtaiLMU8Ab-InUHv1W3oeihY&hl=pl&ei=UWUTTeP7DcbpOde16bwJ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBoQ6AEwAA
Title: Re: intensity of colours
Post by: singonga on April 09, 2012, 03:35:25 AM
http://books.google.pl/books?id=2qAa5hp6KX4C&pg=PA278&lpg=PA278&dq=trans-%5BCo(en)2F2%5D%2B&source=bl&ots=ZaoRVJWHon&sig=5QGBtaiLMU8Ab-InUHv1W3oeihY&hl=pl&ei=UWUTTeP7DcbpOde16bwJ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBoQ6AEwAA
>:( >:( >:(how do i read the response?
Title: Re: intensity of colours
Post by: dipesh747 on April 09, 2012, 04:50:22 AM
He's just telling you to go buy a textbook and read. I wouldn't say that one as it is a post-grad book and you are quite clearly not a post grad.

Here is a start http://www.wou.edu/las/physci/ch462/tmcolors.htm
Title: Re: intensity of colours
Post by: cheese (MSW) on April 10, 2012, 11:53:40 PM
I think we might be more specific:
F. A. Cotton, G. Wilkinson, C. A. Murillo, M. Bochmann,
Advanced Inorganic Chemistry 6th ed (1999). p 824-825
(C&W is not called "The Bible" by inorganic chemists without reason :))
And also for example:C. E. Housecroft, A. G. Sharpe, Inorganic Chemistry 3rd ed p  663.
For you last part consider where F^- and Cl^- are in the spectrochemical series
viz a viz en