title: Crystal structure of 3,5-di-methyl-pyridineN-oxide dihydrate.
abstract: In the title compound, also known as 3,5-lutidineN-oxide dihydrate, C7H9NO·2H2O, the N-O bond is weakened due to the involvement of the O atom as an acceptor of hydrogen bonds from the two water mol-ecules of crystallization present in the asymmetric unit. FusedR35(10) ring motifs based on O-H⋯O hydrogen bonds form chains in the [010] direction, which are further connected by weak C-H⋯O inter-molecular contacts. As a result, the lutidine mol-ecules are stacked in an efficient manner, with π-π contacts characterized by a short separation of 3.569 (1) Å between the benzene rings.
authors.affiliation: Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico.
authors.forename: Rosario
authors.initials: R
authors.lastname: Merino García
authors.affiliation: Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico.
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Ríos-Merino
authors.affiliation: Instituto de Física, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, 72570 Puebla, Pue., Mexico.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Bernès
authors.affiliation: Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico.
authors.forename: Yasmi
authors.initials: Y
authors.lastname: Reyes-Ortega
keywords: crystal structure; dative bond; hydrate; lutidine; ring motif