Two palladium(II) complexes, [Pd(phen) , in acetonitrile and water, respectively. The structures of both complexes are based on a Pd(phen) 2+ metal core, with two acetonitrile molecules binding in a monodentate fashion in complex 1 and two hydroxo bridges holding together two cores to form a dimer in complex 2. Additionally, both complexes present a hydrogen bonded 3-D network involving the triflate anions in 1, and water and triflate anions in 2. Both complexes have been characterized by infrared and 1 H NMR spectroscopy and their crystal structures determined by Xray crystallography.

The complex [Et4N]3[W2(CO)6(OMe)3] (1) has been shown to undergo ligand substitution of the methoxide in the presence of alcohols. This reaction proceeds provided the incoming alcohol is more acidic than the afforded methanol. The reaction is facile at room temperature, with completion of reaction being attained in less than an hour. The exchange for the substituted aryl alcohols 4-aminophenol (2), 4-hydroxypyridine (3), 3-hydroxypyridine (4), 4-cyanophenol (5), and 3-cyanophenol (6) was studied. Complexes 2, 4, 5, and 6 were structurally characterized by X-ray crystal analysis.

New homonuclear dimeric Pd(ii) complexes have been synthesized by the reaction of Pd(en)(2+) or Pd(bipy)(2+) (where en = ethylenediamine and bipy = 2,2'-bipyridine) units with acetamide or by the Pd(ii) mediated hydrolysis of CH(3)CN. In these dimers the two metal centers are bridged by either two amidates or by the combination of one hydroxo group and one amidate ligand. The crystal structures of complexes {[Pd(bipy)](2)(micro-1,3-CH(3)CONH)(2)}(NO(3))(2).H(2)O.1/2(CH(3))(2)CO.1/2CH(3)CN () and {[Pd(bipy)](2)(micro-1,3-CH(3)CONH)(2)}(OTf)(2) () showed intrametallic Pd-Pd distances of 2.8480(8) A () and 2.8384(7) A (), respectively, in accordance with the accepted values for a strong Pd-Pd interaction. The presence of pi[dot dot dot]pi interactions between the bipyridine ligands on the di-micro-amidate complexes of Pd(bipy)(2+) shortens the distance between the two Pd centers and allows the formation of the metal-metal interaction. By contrast, the crystal structure of complex {[Pd(en)](2)(micro-1,3-CH(3)CONH)(2)}(OTf)(2).H(2)O (), (where OTf = triflate) where there is no pi[dot dot dot]pi interaction between the ligands on the metal centers, is also reported, and no Pd-Pd interaction is observed. Additionally, one of the complexes, {[Pd(en)](2)(micro-OH)(micro-CH(3)CONH)}(NO(3))(2) (), presents an interesting hydrogen bonded 3-D network formed by nitrate ions and water molecules. All complexes have been characterized by infrared and (1)H NMR spectroscopy.

The cation in the title complex, [Pd2(OH)2(C10H8N2)2](CF3SO3)2, is essentially planar and features square‐planar Pd centers that are linked via a pair of symmetric hydroxo bridges. In the crystal structure, extensive O—H⋯O hydrogen bonding and π–π inter­actions lead to the formation of cationic columns.