2024-03-29T15:40:55Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/536932022-11-17T02:08:08Zhdl_2115_20057hdl_2115_148Molecular motion in pyridazinium/crown ether supramolecular cation salts of a nickel dithiolene complexLiu, Zun-qiKubo, KazuyaLin, LiHoshino, NorihisaNoro, Shin-ichiroAkutagawa, TomoyukiNakamura, Takayoshi431Supramolecular 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.Royal Society of ChemistryJournal Articleapplication/pdfhttp://hdl.handle.net/2115/53693https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/53693/1/DT42-8_2930-2939.pdf1477-9226Dalton Transactions428293029392013-02-28enginfo:pmid/23247574info:doi/10.1039/c2dt32542jDalton Trans., 2013,42, 2930-2939 - Reproduced by permission of The Royal Society of Chemistry (RSC)author