title: Extensive analysis of N-H...O hydrogen bonding in four classes of phosphorus compounds: a combined experimental and database study.
abstract: The N-H...O hydrogen bond is the characteristic interaction in the crystal structures of N-benzyl-P-phenyl-N'-(p-tolyl)phosphonic diamide, C20H21N2OP or (C6H5)P(O)(NHCH2C6H5)(NHC6H4-p-CH3), (I), diphenylphosphinic 1-methylpropylamide, C16H20NOP or (C6H5)2P(O)[NHCH(CH3)(C2H5)], (II), (S)-1-phenylethylammonium N-[(S)-1-phenylethyl]phenylphosphonamidate, C8H12N+·C14H15NO2P-or [S-(C6H5)CH(CH3)NH3][(C6H5)P(O){S-NHCH(CH3)(C6H5)}(O)], (III), and (4-methylbenzyl)ammonium diphenylphosphinate, C8H12N+·C12H10O2P-or [4-CH3-C6H4CH2NH3][(C6H5)2P(O)(O)], (IV). This article focuses on the N-H...O hydrogen bonds by considering the structures of (I), (II), (III) and (IV), and reviewing their analogous compounds, including 43 (C)P(O)(N)2, 102 (C)2P(O)(N), 31 (C)P(O)(N)(O) and 96 (C)2P(O)(O) structures, deposited in the Cambridge Structural Database (CSD). For the structures with a (C)P(O)(N)2segment, only neutral hydrogen bonds were found in the CSD. The other three classes of compounds included both neutral and `charge-assisted' hydrogen bonds, and the (C)2P(O)(O) structures were particularly noticeable for a high number of cation-anion compounds. The overall tendencies of N...O distances in neutral and cation-anion compounds were compared. The N-H...O hydrogen-bond angles were also analyzed for the four classes of phosphorus compounds.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
authors.forename: Farahnaz
authors.initials: F
authors.lastname: Hamzehee
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Pourayoubi
authors.affiliation: Department of Chemistry, Masaryk University, Kotlarska 2, 61137 Brno, Czech Republic.
authors.forename: Marek
authors.initials: M
authors.lastname: Nečas
authors.affiliation: Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Avda. de las Palmeras 4, 18100, Armilla, Granada, Spain.
authors.forename: Duane
authors.initials: D
authors.lastname: Choquesillo-Lazarte
keywords: Cambridge Structural Database; crystal structure; hydrogen bonding; phosphorus compound; positive/negative charge-assisted N—H...O hydrogen bonds