The crystal structure of the title compound, [Rh(C6H19N4)Cl3]Cl·0.5H2O, is isotypic with the previously reported Ru analogue. The structure contains two crystallographically independent [Rh(Htren)Cl3]+ cations with a facial tridentate coordination of the monoprotonated tren ligand [tren = tris(2-aminoethyl)amine], leading to an overall distorted octahedral coordination environment around the Rh(III) atom. In one of the two cations, the ethylene groups of the two chelate rings as well as the non-coordinating ethylammonium group are disordered over two sets of sites [0.579 (3):0.421 (3) occupancy ratio]. A series of N—H⋯Cl and O—H⋯Cl hydrogen bonds stabilizes the structure
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