Synthesis, Structures, and Spectroscopic, Magnetic, and Electrochemical Properties of (μ-Alkoxo)bis(μ-carboxylato)diruthenium Complexes, M[Ru2(dhpta)(μ-O2CR)2] (M = Na and K, dhptaH5 = 1,3-Diamino-2-hydroxypropanetetraacetic Acid)

[RuCl2(dmso)4] (dmso = dimethyl sulfoxide) was treated with dhptaH5 (1,3-diamino-2-hydroxypropanetetraacetic acid) and carboxylate ligands in the presence of NaOH or KOH and gave dinuclear ruthenium(III) complexes of dhpta with two bridging carboxylates, M[Ru(dhpta)(μ-O2CR)2] (1, R = C6H5, M = Na; 1‘, R = C6H5, M = K; 2, R = p-OHC6H4, M = Na; 3, R = p-NH2C6H4, M = Na; 4, R = CH3, M = Na; 4‘, R = CH3, M = K), which were characterized by elemental analysis, mass, electronic absorption, and 1H and 13C NMR spectroscopies, and X-ray absorption and crystallographic analyses (4, orthorhombic, space group Pca21 with a = 21.359(4) A, b = 7.484(2) A, c = 12.930(2) A, Z = 4, R = 0.065, and Rw = 0.044 for 1116 independent reflections with I > 3σ(I); 4‘·1.5H2O:  monoclinic, P21, a = 7.689(2) A, b = 17.213(2) A, c = 18.103(2) A, β = 94.50(1) °, Z = 4, R = 0.041, and Rw = 0.047 for 4705 independent reflections with I > 3σ(I)). The complex anion consists of two ruthenium atoms bridged by the alkoxide of dhpta and the two...