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A new phosphorothioic triamide structure: P(S)[NHCH 2 C 6 H 5 ] 3
Author(s) -
Raissi Shabari Akbar,
Pourayoubi Mehrdad,
Marandi Pari,
Dušek Michal,
Eigner Václav
Publication year - 2015
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229615004453
Subject(s) - molecular geometry , bond length , crystallography , orientation (vector space) , lone pair , atom (system on chip) , chemistry , geometry , group (periodic table) , molecule , crystal structure , mathematics , organic chemistry , computer science , embedded system
The structure of N , N ′, N ′′‐tribenzylphosphorothioic triamide, C 21 H 24 N 3 PS, (I), and analysis of the bond‐angle sums at the N atoms for this compound, and for 74 structures with a P(S)[N] 3 skeleton and the N atom in a three‐coordinate geometry found in the Cambridge Structural Database [CSD; Groom & Allen (2014). Angew. Chem. Int. Ed. 53 , 662–671], are reported. For (I), the bond‐angle sum at one of the N atoms [359 (1)°] shows a nearly planar configuration, while the other two show a nonplanar geometry with bond‐angle sums of 342 (1) and 347 (1)°. The location of the atoms attached to the nonplanar N atoms suggests an anti orientation of the corresponding lone electron pairs (LEPs) on these N atoms with respect to the P=S group. For 74 structures with a P(S)[N] 3 skeleton and with the N atom in a three‐coordinate geometry, the bond‐angle sums at the N atoms were found to be in the range 293–360°. Among 307 such three‐coordinate N atoms, 39% (120 N atoms) have bond‐angle sums in the range 359–360°, in accordance with sp 2 hybridization, and 45% (138 N atoms) have bond‐angle sums in the range 352–359°, with hybridization close to sp 2 . For the orientation of the LEP with respect to the P=S group, the anti orientation was found to be a general rule for N atoms, with the corresponding bond‐angle sums deviating by more than 8° from the planar value of 360°. In the title structure, the S atom takes part in intermolecular (N—H...)(N—H...)S hydrogen bonds, connecting the molecules into extended chains parallel to the b axis. The co‐operation of one N atom in an N—H...S hydrogen bond as an H‐atom donor, and in an N—H...N hydrogen bond as an acceptor, is a novel feature of the crystal structure.