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Water-Induced Molecular Self-Assembly of Hollow Tubular Crystals

AuthorsPérez-Hernández, Natalia ; Fort, Diego ; Pérez, Cirilo ; Martín, Julio D.
Issue Date2011
PublisherAmerican Chemical Society
CitationCrystal Growth and Design 11: 1054- 1061 (2011)
AbstractWe prepared tubular crystals of the hydrated hydroxylacid, (1R*,5R*)-7,7-diallyl-5-hydroxymethyl-6-oxabicyclo[3.2.1]-octane-1-carboxylic acid, (()9 3 2H2O. Crystals grew in a solution of water and carbon tetrachloride under a water vapor atmosphere. These hollow macrocrystals had mostly hexagonal cross sections and were, on average, approximately 5-10 mm in length, with internal diameters in the range of 300-500 ¿m, and wall thicknesses in the range of 250-400 ¿m. The experimental results showed that crystal growth was compatible with a lattice defect mechanism, where vacancies corresponded to sub-nanoliquid glassy regions, where water ¿diffusion¿ and monomer ¿dissolution¿ processes occurred. We propose that the mechanism underlying the formation of the tubular structures is a ¿build-and-etch¿ growth process. The etching, or dissolution, started at themiddle of each of the basal surfaces of a solid prism and continued along the inside of the long axis; thus, the solid crystals gradually converted into semitubes, which finally became complete hollow tubes. Recrystallization on the external surface was concomitant with the dissolution process; this increased the diameters of the final tubes compared to those of the initial solid prisms.
Identifiersdoi: 10.1021/cg101227u
issn: 1528-7483
Appears in Collections:(IIQ) Artículos
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