Synthesis of New Monomeric Pd(III) and Dimeric (Pd(III),Pd(II)) Complexes with Biuret Formed in Basic Medium

Structural and spectroscopic comparisons of the square-planar four-coordinate [o-phenylenebis(biuretato)]cobaltate(III) complex and the five-coordinate mono- and six-coordinate dicyano adducts

“…2 In spite of their coordinative unsaturation, there have only been a few studies on ligand addition reactions. As reported by Birker et al, 3 the addition reactions of (bbphen)cobaltate() anion [bbphen = o-phenylenebis(biuretato)], [1] Ϫ (Scheme 1), with several organic amines or triphenylphosphine in organic solvents gave the diamagnetic Co III products, which was revealed in the magnetic susceptibility and the absorption spectra. They suggested that the products with amines and triphenylphosphine were six-and five-coordinate adduct complexes, respectively.…”

“…This study is the first example of the complete isolation and characterisation of four-, fiveand six-coordinate complexes each bearing common basal and monodentate ligands. [1]ؒH 2 O (0.069 g, 0.10 mmol) was added KCN (0.065 g, 1.0 mmol). The mixture was stirred for 15 min, giving a green solution.…”

Mixed Palladium(iii)–Nickel(ii) and Palladium(ii)–Copper(ii) Complex Salts with Biuret and the N4-Macrocycle Cyclam

“…The complex exhibits a broad EPR signal (I50 G) with a g-value of 2.2 which is typical for low-spin palladium(III) species. 1 On the basis of these data the following structures are proposed:…”

“…Recently we succeeded in obtaining a new anionic paramagnetic palladium(III)±biuret (BiuH 2 ) complex {[Pd III (Biu) 2 ] À } which is precipitated with NH 4 . 1 On the other hand it is well documented that some combinations of charged metal complex species are capable of forming metal chains which exhibit interesting magnetic properties. 2 We thus tried to obtain mixed complex species reacting [Pd III (Biu) 2 ] À with Cu(cyclam) 2 and Ni(cyclam) 2 .…”

Cellular Pharmacology of Palladinum(III) Hematoporphyrin IX Complexes: Solution Stability, Antineoplastic and Apoptogenic Activity, DNA Binding, and Processing of DNA-Adducts

“…In the framework of the design of new antitumor agents, two paramagnetic Pd III —complexes of hematoporphyrin IX were obtained and biologically tested as representatives of the group of cisplatin-dissimilar metal-based coordination compounds. The reaction conditions for their synthesis were chosen to provide obtaining of Pd 3+ species [ 57 ] and their stabilization in solution and solid state through formation of Hp-complexes [ 32 , 33 , 34 , 35 ]. The complexes were synthesized during the interaction of an initial Pd II compound as a chloride complex ([PdCl 4 2− ]) with the twofold deprotonated at peripheral propionic acid groups hematoporphyrin IX ligand ([Нр -2Н ] 2− ) in alkaline-aqueous medium achieved by adding KOH.…”