We report the synthesis of a mer-triaqua Rh III complex using terpyridine as a meridional tridentate ligand. This is the first example of a structurally characterized six-coordinated mertriaqua complex for any second- or third-row element from the main transition-metal groups (groups 511). This is also the first example of a structurally characterized mer-triaqua complex with terpyridine for any transition metal. Acid dissociation constants, pK a1 and pK a2, of the triaqua complex are determined to be 3.0 and 6.9, respectively.
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