Structure of a Biologically Active Binuclear Palladium Complex in the Compound Bis(bis([μ2-2-Chloroethylammonium) (1,10-Phenanthroline)-Palladium(I)]) · Octanitrates · Dihydrates

摘要

The structure of a biologically active binuclear palladium complex, namely, [(1,10-phenanthroline)Pd(μ2-2-chloroethylammonium)]_2~(4+) · 4NO_3~- · 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, β = 104.23(1)°, V= 7052(2) A3,Z = 8, and ρ = 1.88g/cm~3. The final discrepancy factor is R1 = 0.0316 for 15581 symmetrically nonequivalent reflections with I ≥ 2σ(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 NO_3~- anions, and two water molecules. The π-π 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 NH_3~+ groups.