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Layered metal-organic frameworks and metal-organic nanosheets have been regarded as an important series of low-dimensional materials. Their flexible designability and intrinsic porosity allow layered metal-organic frameworks and metal-organic nanosheets to be differentiated from inorganic counterparts. The present review article is devoted to collecting pieces of research aiming at exploiting layered metal-organic frameworks and metal-organic nanosheets as innovative nanomaterials. Spearheaded by an introductory part as Section 1, the present review article includes Section 2 (Physical properties), Section 3 (Electrocatalysis), Section 4 (Separation and filtration), Section 5 (Energy devices), Section 6 (Sensors), Section 7 (Theories for unveiled properties), and Section 8 (Conclusions and outlook)

学位の種別: 課程博士, 審査委員会委員 : （主査）東京大学教授 小森 文夫, 東京大学教授 福山 寛, 東京大学准教授 桂 法称, 東京大学准教授 長谷川 幸雄, 東京大学准教授 松田 巌

A bulk material comprising stacked nanosheets of nickel bis(dithiolene) complexes is investigated. The average oxidation number is -3/4 for each complex unit in the as-prepared sample; oxidation or reduction respectively can change this to 0 or -1. Refined electrical conductivity measurement, involving a single microflake sample being subjected to the van der Pauw method under scanning electron microscopy control, reveals a conductivity of 1.6 × 10(2) S cm(-1), which is remarkably high for a coordination polymeric material. Conductivity is also noted to modulate with the change of oxidation state. Theoretical calculation and photoelectron emission spectroscopy reveal the stacked nanosheets to have a metallic nature. This work provides a foothold for the development of the first organic-based two-dimensional topological insulator, which will require the precise control of the oxidation state in the single-layer nickel bisdithiolene complex nanosheet (cf. Liu, F. et al. Nano Lett. 2013, 13, 2842).