Palladium(I) and palladium(II) unsaturated carboxylate complexes with small molecules: Synthesis and X-ray structure of Pd4(μ-CO)4(μ-trans-CH3CHCHCO2)4 and Pd4(μ-NO)2(μ-CH2C(CH3)CO2)6

New polynuclear palladium complexes containing anions of α-unsaturated carboxylic acids and coordinated small molecules (CO and NO) were synthesized and characterized by IR-spectroscopy and X-ray diffraction analysis. Also a possibility of synthesis of corresponding nitrite compounds was studied.