title: Two-dimensionally stacked heterometallic layers hosting a discrete chair dodecameric ring of water clusters: synthesis and structural study.
abstract: The stacked two-dimensional supramolecular compound catena-{Co(amp)3Cr(ox)3·6H2O} (amp = 2-picolylamine, ox = oxalate) has been synthesized from the bimolecular approach using hydrogen bonds. It is built from layers in which both Co(amp)(3+) (D) and Cr(ox)(3-) (A) ions are bonded in a repeating DADADA… pattern along the a and c axes by multiple hydrogen bonds. These layers host a well resolved R12 dodecameric discrete ring of water clusters built by six independent molecules located around the 2c centrosymmetric Wyckoff positions of the P21/n space group in which the compound crystallizes. These clusters are ranged along the [001] direction, occupy 733.5 Å(3) (22.0%) of the unit cell and have a chair conformation via 12 hydrogen bonds. The water molecules of the cluster are linked with stronger hydrogen bonds than those between the cluster and its host, which explains the single continuous step of the dehydration process of the compound.
authors.affiliation: Laboratory of Applied Inorganic Chemistry, Faculty of Sciences, University of Yaoundé I, PO Box 812, Yaoundé, Cameroon.
authors.forename: Patrice
authors.initials: P
authors.lastname: Kenfack Tsobnang
authors.affiliation: CRM2, CNRS Université de Lorraine, Vandoeuvre-lès-Nancy CEDEX BP 70239, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Wenger
authors.affiliation: Université de Lorraine, LIEC, UMR7360, Vandoeuvre-lès-Nancy F-54506, France.
authors.forename: Coralie
authors.initials: C
authors.lastname: Biache
authors.affiliation: Laboratory of Applied Inorganic Chemistry, Faculty of Sciences, University of Yaoundé I, PO Box 812, Yaoundé, Cameroon.
authors.forename: John
authors.initials: J
authors.lastname: Lambi Ngolui
authors.affiliation: Department Higher Teacher's Training College, University of Yaoundé I, PO Box 47, Yaoundé, Cameroon.
authors.forename: Siméon
authors.initials: S
authors.lastname: Ponou
authors.affiliation: CRM2, CNRS Université de Lorraine, Vandoeuvre-lès-Nancy CEDEX BP 70239, France.
authors.forename: Slimane
authors.initials: S
authors.lastname: Dahaoui
authors.affiliation: CRM2, CNRS Université de Lorraine, Vandoeuvre-lès-Nancy CEDEX BP 70239, France.
authors.forename: Claude
authors.initials: C
authors.lastname: Lecomte
keywords: flexible crystals; heterometallic compound; hydrogen bonds; supramolecular materials; two-dimensional stacked structure; water cluster