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Inorganic two-dimensional(2D)materials have attracted tremendous interests recently.Controlled functionalization of 2D materials can achieve additional functions and properties,but usually suffers from less modification ratio,poor controllability,defects and so on.2D organic metal chalcogenide(OMC)materials with periodically arranged organic functional group between the inorganic analogues layers offer opportunities to develop adjustable electrical properties and extended applications.In this mini-review,we will provide an overview of the composition and preparation,band gap engineering,and conductivity modulation of the serial OMC materials and illustrate the application investigation such as biomimetic catalysis,photodetecting and chemiresistive gas sensing.