Bibinou Posted January 12, 2007 Share Posted January 12, 2007 Hello How can we explain that NR3 a stronger base is compared to PR3 (with R : alkyl group)? How can we compare CF2, SiF2 und GeF2 concerning tehir stability and their structure? Thank you very much. See you soon Link to comment Share on other sites More sharing options...
ecoli Posted January 12, 2007 Share Posted January 12, 2007 the strength of an acid or base, if you use the Lewis definition, is the molecule's ability to donate or attract electrons. Stronger bases are better electron donors, or in other words, the stronger bases have less ability to hang on to their electrons. Compare the electronegativity of nitrogen and phosphorus. Link to comment Share on other sites More sharing options...
budullewraagh Posted January 12, 2007 Share Posted January 12, 2007 According to that explanation phosphines (P being less electronegative than N) would be more basic (less in control of their electrons) than the corresponding amines. Trivalent phosphorus isn't at all a hard base because its lone pair is in a far larger probability cloud than that of nitrogen. As a result, the orbitals don't align well and phosphines aren't good at deprotonating anything. Link to comment Share on other sites More sharing options...
KURDISH-BOY Posted January 28, 2007 Share Posted January 28, 2007 what does CF2 sif2 and get2 mean? Link to comment Share on other sites More sharing options...
YT2095 Posted January 28, 2007 Share Posted January 28, 2007 Carbon, Silicon and Germanium Fluorides. Link to comment Share on other sites More sharing options...
John Cuthber Posted January 28, 2007 Share Posted January 28, 2007 It's a fair question; do those difluorides (of 4 valent elements) exist for any length of time? Link to comment Share on other sites More sharing options...
woelen Posted January 28, 2007 Share Posted January 28, 2007 I can imagine that they can exist for a long time if they are VERY VERY dilute. The same is true for hydroxyl. Astronomers have found clouds with a large percentage of hydroxyl, but these clouds still have a lower density than the best vacuum we can make on earth. This kind of molecules are VERY reactive, but as long as they do not meet anything, they can exist. Link to comment Share on other sites More sharing options...
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