Abstract

The pentadentate complex cis-polar, trans(Cl,O 5)-Na 2[Rh(1,3-pddadp)Cl] · 7H 2O (where 1,3-pddadp is the 1,3-propanediamine- N, N ′-diacetate- N, N ′-di-3-propionate ion) was prepared and characterized. The structure of the complex was determined by X-ray analysis. The rhodium(III) ion is surrounded octahedrally by the two N and three O atoms of the 1,3-pddadp ligand and one chloride anion. The chloride anion occupies the trans position with respect to the oxygen atom of the axial glycinate ring and the cis-polar orientation with respect to the tertiary nitrogen atom bonded to the uncoordinated 3-propionate group. The investigated pentadentate complex derives directly from the trans(O 5O 6) isomer of the corresponding hexadentate [Rh(1,3-pddadp)] − complex. The conformations of the chelate rings were found to be envelope and flat for in-plane (G ′′) and axial (R ′) glycinate rings, and sofa and chair for in-plane β-alaninate (G ′) and 1,3-propanediamine (T) rings, respectively. The electronic absorption spectrum of cis-polar, trans(Cl,O 5)-[Rh(1,3-pddadp)Cl] 2 − is also given and compared with those of hexadentate trans(O 5O 6)-[Rh(1,3-pddadp)] − and trans(O 5)-[Rh(1,3-pddadp)] − complexes.

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