摘要:
IntroductionThe nickel dithiolate complex [Ni(dmit)2] (dmit2− = 2thioxo1,3dithiole4,5dithiolate) is a planar π conjugated molecule having an openshell electronic structure, and a variety of [Ni(dmit)2] salts with characteristic electronic and magnetic properties have been reported.1In its partially oxidized state, [Ni(dmit)2] gives organic metals such as TTF[Ni(dmit)2]2, which exhibits a superconducting transition at 1.62 K (7 kbar).2On the other hand, monovalent [Ni(dmit)2]−bears anS = 1/2 spin and can be a useful building block for molecular magnets, including spinladders.3Recently, supramolecular structures formed through noncovalent interactions have increasingly attracted interest in view of crystal engineering.4Weak interactions such as hydrogen bonding and π–π interactions are utilized to construct infinite columns and chiral doublehelices, which are important models in biological systems.5–8The cation structure largely affects [Ni(dmit)2]−arrangements within the crystals. We introduced supramolecular cation structures composed of inorganic metal cations–crown ethers as a counter cation for [Ni(dmit)2]−anionic species. In the crystals, [Ni(dmit)2]−arrangements are regulated by supramolecular cation structures, showing a large diversity in intermolecular interaction modes between [Ni(dmit)2]−as well as in electrical and magnetic properties determined by these interactions.9In addition, supramolecular cations exhibited specific structures including ionic channels.10In this paper, we report the crystal structure of K(DB18c6)[M(dmit)2](CH3CN)2(DB18c6 = dibenzo18crown6;M = Ni, Au) (Scheme 1), in which K+(DB18c6)(CH3CN)2supramolecular cations form a onedimensional array structure and [M(dmit)2] exists as an isolated monomer.
ISSN:1466-8033
DOI:10.1039/b107858e
出版商:RSC
年代:2001
数据来源: RSC