By Gernot Frenking, Sason Shaik
This can be the suitable supplement to ''Chemical Bonding - around the Periodic Table'' through an identical editors, who're of the head scientists engaged on this subject, every one with wide adventure and demanding connections in the community.
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Extra info for The Chemical Bond : Chemical Bonding Across the Periodic Table
290, 488–494. 1 Introduction Chemical experience has shown that compounds with multiple bonds between heavier main-group atoms are much more difﬁcult to synthesize, and that they often exhibit greatly different geometries than their counterparts of the ﬁrst octal row . The most prominent examples are the group-14 homologues of ethylene and acetylene. The chemical bonds in H2 C=CH2 and HC≡CH are archetypical examples for σ- and π-bonding in planar alkenes and linear alkynes. 1) . Experimental evidence is in agreement with the theoretical predictions.
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At the inversion transition state, the N–H bonds in NH3 still exhibit the nominal sp2 hybridization for a trigonal coordination. The substantial and worsening hybridization defects are particularly notable for the N–H bonds in NH2 F and NHF2 ; and then they are also signiﬁcant for the N–F bonds in NHF2 and especially in NF3 . One might therefore expect to have very large barriers for species like PF3 , AsF3 , SbF3 , or BiF3 . However, in these cases it has been found unexpectedly by computations that inversion proceeds not via a D3h -symmetrical trigonal but via a C2v -symmetrical Y-shaped transition state, leading to lower barriers and, indeed, an inverted trend with the barriers decreasing down the group .
The Chemical Bond : Chemical Bonding Across the Periodic Table by Gernot Frenking, Sason Shaik