Two novel octahedral rhenium(III) selenocyanide cluster complexes [(nBu) 4 N] 2 Ni(H 2 O) 5 [Re 6 Se 8 (CN) 6 ]·2H 2 O (1) and [(nBu) 4 N] 2 Mn(H 2 O) 4 [Re 6 Se 8 (CN) 6 ]·2H 2 O (2) have been prepared by the reaction of K 4 [Re 6 Se 8 (CN) 6 ]·3.5H 2 O, (nBu) 4 NBr and Ni(OAc) 2 (or MnSO 4 ) in aqueous solution. The complexes have been structurally solved in the orthorhombic unit cell Pbca with parameters: a = 19.393(2), b = 17.292(2), c = 37.255(4) Å for 1, and a = 19.518(4), b = 17.488(3), c = 37.997(5) Å for 2. The cluster anions and M 2+ form ionic pairs
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