Two types of monoethyl α-anilino­benzyl­phosphonates: a zwitterion and a molecular compound

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Abstract:

The crystal structures of the potential antitumour agents monoethyl (α-anilinobenzyl)­phosphonate, C15H18NO3P, (I), and its 4-azo­benzene-substituted derivative monoethyl {α-[4-(phenyl­diazenyl)­anilino]­benzyl}phosphonate, C21H22N3O3P, (II), are described. A zwitterionic form of (I) and a neutral molecular form of (II) are observed, which is fully in accordance with previously reported spectroscopic studies. In both structures, hydrogen bonding induces the formation of zigzag head-to-head double layers parallel to the crystallographic b axis.

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108270104009497

Publication date: June 1, 2004

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