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  • Title: Pnicogen-bonded anionic complexes.
    Author: Del Bene JE, Alkorta I, Elguero J.
    Journal: J Phys Chem A; 2014 May 08; 118(18):3386-92. PubMed ID: 24762297.
    Abstract:
    Ab initio MP2/aug'-cc-pVTZ calculations have been carried out to investigate the pnicogen-bonded complexes H2YP:X(-), for X,Y = Cl, NC, F, CCH, and CH3. Of the 36 possible complexes, only 21 are unique equilibrium structures. All substituents form (H2XPX)(-) complexes with symmetric X-P-X bonds. The P-A ion-molecule pnicogen bonds in these and some additional complexes have partial covalent character, while some P-A' covalent bonds have partial ion-molecule character. A and A' are the atoms of X and Y, respectively, which are directly bonded to P. Complexes with these types of bonds include the symmetric complexes (H2XPX)(-), H2(CH3)P:F(-), H2(CCH)P:F(-), H2FP:NC(-), H2FP:Cl(-), H2FP:CN(-), and H2(NC)P:Cl(-). Charge transfer from A to the P-A' σ* orbital stabilizes H2YP:X(-) complexes and leads to a reduction of the negative charge on X. For fixed X, the smallest negative charge occurs in the symmetric complex. Then, for a given X, the order of decreasing negative charge with respect to Y is CH3 > CCH > CN (bonded through C) > F > NC (bonded through N) > Cl, which is also the order of decreasing P-A distance. EOM-CCSD spin-spin coupling constants (1p)J(P-A) differentiate between shorter ion-molecule pnicogen bonds with partial covalent character and longer P···A ion-molecule pnicogen bonds. Similarly, coupling constants (1)J(P-A') differentiate between longer covalent P-A' bonds with partial ion-molecule character and shorter P-A' covalent bonds.
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