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Exploring new oxidation state of elements is an important and challenging issue.Rare-earth elements all exhibit the stable+3 oxidation state,while the+2 oxidation state is accessible except radioactive Pm.However,until 2019,only cerium has the+4 oxidation state in molecular complexes.Since 2019,four Tb(Ⅳ)and Pr(Ⅳ)molecular complexes have been successful prepared and will open a new avenue for the development of tetravalent ra-re-earth chemistry.This emerging topic briefly describes the recent advances and prospects of the tetravalent rare-earth chemistry.