Atomic-level control over the position and growth of as ingle and continuous metal chain is an ambitious goal that often requires complex and costly processes.H erein, we demonstrate that 1Pd-DNA molecules,c omprising ac ontinuous single chain of Pd II ions,can be prepared by asimple selfassembly reaction between the complex [Pd(Cheld)(CH 3 CN)] (1Pd_CH 3 CN)(Cheld = chelidamic acid) and single-stranded DNAh omopolymers (ss-DNA) containing adenine (A)o r7deazaadenine (X)b ases.T he single Pd II -base pairs [1Pd(N1-A)] and [1Pd(N1-X)] were synthesized and characterized in solution and solid-state (X-ray diffraction) revealing an arrangement similar to that of natural Watson-Crickb ase pairs.S ubsequently, 1Pd-DNA hybrids were prepared, characterized, and their structures studied by small-angle X-ray scattering (SAXS) and ab-initio calculations.T he results indicate that the 1Pd-DNA structures resemble that of double-stranded DNA, with one strand being replaced by asupramolecular stack of continuous Pd II complexes.