カフェ酸のリチウム塩およびナトリウム塩水和物の結晶構造解析
Caffeic acid (3,4-dihydroxycinnamic acid) was reacted with lithium and sodium hydroxides in aqueous solution to yield crystalline polymeric hydrate salts. In the lithium compound, each Li cation adopts a near-tetrahedral geometry coordinated by three carboxylate oxygen atoms and one water molecule; the carboxylate groups bridge Li centers in a chain-like arrangement along one crystallographic axis, with additional hydrogen bonding between coordinated water and catechol hydroxyl groups. In the sodium compound, the Na cation is sevenfold-coordinated by one water molecule, two monodentate carboxylate groups, and four catechol oxygen atoms. Face- and edge-sharing of coordination polyhedra generates chains that are further interconnected through bridging propenoate ligands and intermolecular hydrogen bonds, producing a three-dimensional network structure.
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/38584729