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We report on the syntheses and characterizations of single crystalline and polycrystalline Sr 2 Co 3 S 2 O 3  with a novel crystal structure type. It contains Co–O 2-leg rectangular ladders and necklace ladders. The two ladders share common legs and construct a  hybrid spin ladder . A rare meridional heteroleptic octahedral coordination is found for the Co 2+  ions in the 2-leg ladder. Within the necklace ladders, the Co 2+  ions are in  trans -octahedral coordination. An antiferromagnetic order is observed at T N  ~ 267 K, while a broad maximum in magnetic susceptibility is found below T N . This relatively high ordering temperature among Co-based ladder compounds is related to the highly anisotropic  mer -coordination of the Co 2+  ions. The  trans -octahedrally coordinated Co 2+  ions, on the other hand, corresponds to the possible short-range magnetic correlations through dimers with an effective. This results in a rare situation that spin ordering and spin dimers coexist down to 2 K.

Coexistence of spin ordering on ladders and spin dimer formation in a new-structure-type compound Sr2Co3S2O3