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The flexible small-cavity macrocycle,trans-calix[2]benzene[2]pyrrolide(H2L),has been found experimentally to complexate low-valent UⅢ and UⅣ with binding pockets of bis(arene)and bis(pyrrolide),respectively.[1-5] This switchable coordination of the uranium center has been explored using relativistic density functional theory(DFT)in this work.