Pienack, Nicole, Ruiz Arana, Laura, Bensch, Wolfgang and Terraschke, Huayna (2016) In Situ Studies on Phase Transitions of Tris(acetylacetonato)-Aluminum(III) Al(acac)3. Crystals, 6 (12). p. 157. DOI 10.3390/cryst6120157.

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Abstract

In situ investigations on the nucleation and crystallization processes are essential for
understanding of the formation of solids. Hence, the results of such experiments are prerequisites
for the rational synthesis of solid materials. The in situ approach allows the detection of precursors,
intermediates, and/or polymorphs, which are mainly missed in applying ex situ experiments. With a
newly developed crystallization cell, simultaneous in situ experiments with X-ray diffraction (XRD)
and luminescence analysis are possible, also monitoring several other reaction parameters. Here,
the crystallization of the model system tris(acetylacetonato)-aluminum(III) Al(acac)
3
was investigated.
In the time-resolved in situ XRD patterns, two polymorphs of Al(acac)
3
, the
α
- and the
γ
-phase, were
detected at room temperature and the influence of the pH value onto the product formation was
studied. Moreover, changes in the emission of Al(acac)
3
and the light transmission of the solution
facilitated monitoring the reaction by in situ luminescence. The first results demonstrate the potential
of the cell to be advantageous for controlling and monitoring several reaction parameters during the
crystallization process.

Document Type:	Article
Keywords:	in situ studies; crystallization; in situ XRD; in situ luminescence; model system Al(acac) 3
Research affiliation:	Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence Kiel University
Refereed:	Yes
Open Access Journal?:	Yes
Publisher:	MDPI
Date Deposited:	16 Jan 2018 15:08
Last Modified:	03 Jun 2019 15:47
URI:	https://oceanrep.geomar.de/id/eprint/41510

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