Synthesis and dehydrative condensation of square-planar mono- and dinuclear hydroxopalladium complexes with the hydrotris(3,5-diisopropylpyrazolyl)borato ligand (Tp(2)(iPr)), Tp(2)(iPr)(Py)Pd-OH, and (mu-OH)(2){PdTp(2)(iPr)(H2O)}(2)

Mono- and dinuclear hydroxopalladium complexes (kappa(2)-Tp(iPr2,X))(py)Pd- OH (1; X = H, Br) and (mu-OH)(2){Pd(kappa(2)-Tp(iPr2))(H2O)}(2) (2) are pre pared by base hydrolysis of the corresponding chloride complexes (kappa(2)- Tp(iPr2,X))(py)pdcl (3) and (mu-Cl)(2){Pd(kappa(3)-Tp(iPr2))}(2) (4), respe ctively. Functionalization of the OH part in 1 is effected via dehydrative condensation with protic substrates (H-A) to give a series of substituted p roducts, (kappa(2)-Tp(iPr))(py)Pd-A (5), and treatment of the dinuclear com plex 2 with excess acetic acid affords the mononuclear diacetato complex 6, (kappa(2)-Tp(iPr2)-H)Pd(OAc)(2)(HOAc). Complexes 1-4 and 6 have been chara cterized crystallographically, and it is revealed that complexes 2 and 6 in volve cyclic hydrogen-bonding interaction among the nitrogen atom of the pe ndent noncoordinated pyrazolyl group, the hydrogen atom in the protic part of the ligand (OH, AcOH), and, in the case of 2, an external water molecule .