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Molecular motion in pyridazinium/crown ether supramolecular cation salts of a nickel dithiolene complex

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Title: Molecular motion in pyridazinium/crown ether supramolecular cation salts of a nickel dithiolene complex
Authors: Liu, Zun-qi Browse this author
Kubo, Kazuya Browse this author
Lin, Li Browse this author
Hoshino, Norihisa Browse this author
Noro, Shin-ichiro Browse this author →KAKEN DB
Akutagawa, Tomoyuki Browse this author
Nakamura, Takayoshi Browse this author →KAKEN DB
Issue Date: 28-Feb-2013
Publisher: Royal Society of Chemistry
Journal Title: Dalton Transactions
Volume: 42
Issue: 8
Start Page: 2930
End Page: 2939
Publisher DOI: 10.1039/c2dt32542j
PMID: 23247574
Abstract: Supramolecular cations formed by monoprotonated pyridazinium cations and cis-anti-cis-dicyclohexano[18]-crown-6 (DCH[18]-crown-6) or dibenzo[18]-crown-6 (DB[18]-crown-6) were introduced into [Ni(dmit)2]- salts (where dmit^[2-] = 2-thione-1,3-dithiole-4,5-dithiolate). X-ray crystal structure analysis of (pyridazinium+)(DCH[18]-crown-6)[Ni(dmit)2]- (1) revealed a chair-type conformation of the DCH[18]-crown-6 moiety. A V-shaped conformation of the DB[18]-crown-6 moiety was observed in (pyridazinium+)(DB[18]-crown-6)2[Ni(dmit)2]-(H2O)2 (2). Nitrogen atoms in the pyridazinium cations interacted with the oxygen atoms of the DCH[18]-crown-6 and DB[18]-crown-6 through N-H+~O hydrogen bonds, forming 1 : 1 and 1 : 2 supramolecular structures, respectively. Sufficient space for molecular motions of the pyridazinium cations, namely flip-flop and in-plane rotations, exists in salt 1. Disorder in nitrogen atoms was observed by X-ray analysis, indicating dynamic motion of the pyridazinium cation, namely flip-flop motion and in-plane motion. A potential energy calculation further supported the possibility of dynamic motion of cations in the crystal. By contrast, the flip-flop motion of the pyridazinium group in salt 2 is restricted by the two nearest-neighbouring DB[18]-crown-6 molecules. Weak antiferromagnetic intermolecular interactions between the [Ni(dmit)2]- anions in the two-dimensional layers of salt 1 were observed, resulting in alternating antiferromagnetic Heisenberg chain-type magnetic susceptibility. Quasi-one-dimensional intermolecular interactions between the [Ni(dmit)2]- anions were observed in salt 2, whose magnetic behaviour followed the Bonner-Fisher model.
Rights: Dalton Trans., 2013,42, 2930-2939 - Reproduced by permission of The Royal Society of Chemistry (RSC)
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 久保 和也

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