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Iodine Clathrated: A Solid‐State Analogue of the Iodine–Starch Complex
Author(s) -
Pan Fangfang,
Chen Yingchun,
Li Siyu,
Jiang Minzhi,
Rissanen Kari
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201901734
Subject(s) - halogen , crystallography , trigonal crystal system , iodine , crystal structure , chemistry , hydrogen bond , molecule , hexagonal crystal system , chloride , crystal (programming language) , organic chemistry , alkyl , computer science , programming language
Co‐crystallizing iodine with a simple dicationic salt (1,8‐diammoniumoctane chloride) results in the clathration of the iodine (I 2 ) molecules inside trigonal and hexagonal helical channels of the crystal lattice with 72 wt % overall I 2 loading. The I 2 inside the bigger trigonal channel forms a I−I⋅⋅⋅I−I⋅⋅⋅I−I halogen‐bonded infinite helical chain, while the I 2 in the smaller hexagonal channel is disordered. In both channels the I 2 interaction with the channel wall happens through I−I⋅⋅⋅Cl − halogen bonds. The helical channels in the crystal lattice are constructed via the strong charge‐assisted H 2 N + H⋅⋅⋅Cl − hydrogen bonds between the dications and the chloride anions. The structure shows a marked similarity with the well‐known starch–I 2 system, and thus may provide insight for the yet unresolved structure of the I 2 in the helical starch channel.