title: Crystal structure of 3-methyl-pyridine-2-carbaldehyde 4-methyl-thio-semi-carba-zone monohydrate.
abstract: In the title hydrate, C9H12N4S·H2O (systematic name: 3-methyl-1-{(E)-[(3-methyl-pyridin-2-yl)methyl-idene]amino}-thio-urea monohydrate), a small twist is noted between the pyridine ring and the rest of the organic mol-ecule [dihedral angle = 6.96 (5)°]. The imine and pyridine N atoms are syn, and the amine H atoms are anti. The latter arrangement allows for the formation of an intra-molecular N-H⋯N(imine) hydrogen bond. Both the N-bonded H atoms form hydrogen bonds to symmetry-related water mol-ecules, and the latter forms O-H hydrogen bonds with the pyridine N and thione S atoms. These inter-actions lead to supra-molecular layers that stack along the a-axis direction with no specific inter-actions between them.
authors.affiliation: Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
authors.forename: Nur Shuhada Mohd
authors.initials: NS
authors.lastname: Mokhtaruddin
authors.affiliation: Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
authors.forename: Thahira Begum S A
authors.initials: TB
authors.lastname: Ravoof
authors.affiliation: Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
authors.forename: Mohamed Ibrahim Mohamed
authors.initials: MI
authors.lastname: Tahir
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink
keywords: crystal structure; hydrogen bonding; thio­semicarbazone