Structure of a biologically active binuclear palladium complex in the compound bis(bis[(m2 2 chloroethylammonium) (1,10 phenanthroline) palladium(I) octanitrates dihydrates
The structure of a biologically active binuclear palladium complex, namely, (1,10 phenanthroline) Pd(m2 2 chloroethylammonium)24+ 4NO3 H2O, has been determined using X ray diffraction analysis. The compound crystallizes in the monoclinic system, space group of symmetry Cc, with the unit cell parameters a 24.527(3) A, b 13.097(1) A, c 22.651(3) A, b 104.23(1)deg, V 7052(2) A3, Z 8, and r 1.88 g/cm3. The final discrepancy factor is R1 0.0316 for 15581 symmetrically nonequivalent reflections with I 2s(I) wR2 0.0513, and GooF 1.047. The palladium atoms reside in the oxidation state of 1+ which is rarely encountered in organometallic compounds. The asymmetric part of the unit cell contains two chemically equivalent but crystallographically independent positively charged binuclear palladium complexes, eight NO3 anions, and two water molecules. The p p stacking interaction between the nearest 1,10 phenanthroline rings of the neighboring layers takes place. Moreover, the interlayer and intralayer interactions occur through electrostatic interaction forces and a complex three dimensional system of hydrogen bonds, which are formed by water molecules and N3+ groups.