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Microsphere Assemblies via Phosphonate Monoester Coordination Chemistry
Department of Chemistry, University of Calgary, Calgary, Canada..
Department of Chemistry, University of Calgary, Calgary, Canada..
Department of Chemistry, University of Calgary, Calgary, Canada; Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.ORCID iD: 0000-0003-4497-4248
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4888-6237
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2018 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 24, no 7, p. 1533-1538Article in journal (Refereed) Published
Abstract [en]

By complexing a bent phosphonate monoester ligand with cobalt(II), coupled with in situ ester hydrolysis, coordination microspheres (CALS=CALgary Sphere) are formed whereas the use of the phosphonic acid directly resulted in a sheet-like structure. Manipulation of the synthetic conditions gave spheres with different sizes, mechanical stabilities, and porosities. Time-dependent studies determined that the sphere formation likely occurred through the formation of a Co2+ and ligand chain that propagates in three dimensions through different sets of interactions. The relative rates of these assembly processes versus annealing by ester hydrolysis and metal dehydration determine the growth of the microspheres. Hardness testing by nanoindentation is carried out on the spheres and sheets. Notably, no templates or capping agents are employed, the growth of the spheres is intrinsic to the ligand geometry and the coordination chemistry of cobalt(II) and the phosphonate monoester.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 24, no 7, p. 1533-1538
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Other Materials Engineering
Research subject
Engineering Materials
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URN: urn:nbn:se:ltu:diva-67367DOI: 10.1002/chem.201705985ISI: 000423804800012PubMedID: 29336090OAI: oai:DiVA.org:ltu-67367DiVA, id: diva2:1176695
Note

Validerad;2018;Nivå 2;2018-02-02 (andbra)

Available from: 2018-01-23 Created: 2018-01-23 Last updated: 2018-02-16Bibliographically approved

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