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The synthesis is described of a set of new N‐heterocyclic compounds which are derivatives of 1,10‐phenanthroline. The compounds are designed to be general purpose chelating agents which could function as tri‐, tetra‐ or hexadentate ligands with transition metal ions. Fused‐ring molecular components have been included in the design of the compounds so that they may function as binding agents to DNA through intercalation. This includes the synthesis of substituted derivatives of pyrazino[2,3‐f][1,10]phenanthroline and dipyrido[3,2‐a:2′3′‐c]phenazine.

Pd(CaH6NO3)2, C6HI2N206Pd , is orthorhombic, space group P2~2~2~, with a = 8.828 (8), b = 9.705 (9), c = 11.315 (7) A, Z = 4. The structure was refined to R = 0.054 for 1763 photographic intensities. The two amino acid molecules are bonded in an irregular cis square-planar arrangement about the Pd atom [average Pd-N 2.023 (7), average Pd-O 2.005 (7) /~,]. One five-membered chelate ring is almost planar whereas the other is distorted. The two serine molecules have different conformations for the hydroxyl groups, one having a gauche-gauche and the other a gauche-anti conformation. The structure is stabilized by intermolecular hydrogen bonds in which all active protons are involved.