蛍光性候補化合物としてのトリアクア・トリス（1,1,1-トリフルオロ-4-オキソペンタン-2-オラト）セリウム（III）の結晶構造解析
This study reports the crystal structure of a cerium(III) coordination complex bearing three 1,1,1-trifluoro-4-oxopentan-2-olate (tfa) anions as bidentate ligands and three water molecules as monodentate ligands, yielding a nine-coordinate Ce center in a monocapped square-antiprismatic geometry. The CF₃ groups of all three independent tfa units exhibit positional disorder at approximately 0.8:0.2 occupancy ratios. Intermolecular hydrogen bonding between tfa and water molecules along the [110] and [1-10] directions produces a two-dimensional layered network. The fluorine substituents extend the Ce–Ce intermolecular distance relative to the analogous acetylacetonate derivatives, a structural feature intended to suppress concentration quenching. Despite this design, Ce-based luminescence was not detected experimentally.
Incorporation of fluorine-bearing tfa ligands was intended to increase Ce–Ce distances and thereby reduce concentration quenching, but Ce-based fluorescence emission was not observed under the experimental conditions.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/29850060