Interaction of palladium with sulphaguanidine

Palladium(II) chloride complexation: Spectrophotometric investigation in aqueous solutions from 5 to 125°C and theoretical insight into Pd-Cl and Pd-OH2 interactions

“…Our proposed cumulative formation constant log 10 ␤ 0,1,4 ϭ 11.557 Ϯ 0.064 (Eqn. AI.3) at 20°C also lies in the range of literature values, considering variations due to activity coefficients, of 11.29 (I ϭ 0; van Middlesworth and Wood, 1999), 9.72, (I ϭ 0.1;Rittner et al, 1970), 12.24 (I ϭ 0.8; Schukarev et al, 1961); 11.52 (I ϭ 0.86; Biryukov and Shlenskaya, 1964a), 10.42 (I ϭ 1.0; Burger, 1964a), and 11.54 (I ϭ 1.0; Elding, 1972b).…”

“…The spectra of Figure 2 display the characteristic features of ligand-to-metal charge transfer of the unhydrolyzed monomeric square planar PdCl r (OH 2 ) 4-r 2-r complexes (Rittner et al, 1970;Elding, 1972b;Elding and Olsson, 1978). Resolution of the weaker d-d spectra of these complexes, which occur in the 300 to 600 nm range (Elding and Olsson, 1978), required solutions of greater Pd(II) concentration are were not considered in this study.…”

“…A number of sets of low temperature complexation constants for the monomeric PdCl r (H 2 O) 4-r 2-r species (r ϭ [0,4]) have already been proposed, mainly from potentiometric, solubility, and spectrophotometric studies (Sundaram and Sandell, 1955;Droll et al, 1957;Schukarev et al, 1961;Jørgensen, 1962;Burger and Dyrssen, 1963;Grinberg et al, 1963;Biryukov and Shlenskaya, 1964a;Biryukov and Shlenskaya, 1964b;Burger, 1964a;Burger, 1964b;Shlenskaya and Biryukov, 1964;Weed, 1964;Fasman et al, 1965;Levanda, 1968;Gel'fman and Kiseleva, 1969;Rittner et al, 1970;Kravtsov and Martynova, 1971;Elding, 1972b;Gulko and Schmuckler, 1973;Hsu et al, 1991;Tait et al, 1991;van Middlesworth and Wood, 1999). Spectrophotometric studies have, however, provided the most insight into palladium chloride complexation (e.g., Elding 1972a;Elding 1972b;Elding, 1973;Elding, 1975), given the possibility of detecting and quantifying the presence of different complexes by virtue of their different ligand-to-metal charge transfer spectra (Sundaram and Sandell, 1955;Droll et al, 1957;Schukarev et al, 1961;Jörgensen, 1962;Burger and Dyrssen, 1963;Biryukov and Shlenskaya, 1964a;Biryukov and Shlenskaya, 1964b;Burger, 1964a;Shlenskaya and Biryukov, 1964;Levanda, 1968;…”

“…Spectrophotometric studies have, however, provided the most insight into palladium chloride complexation (e.g., Elding 1972a;Elding 1972b;Elding, 1973;Elding, 1975), given the possibility of detecting and quantifying the presence of different complexes by virtue of their different ligand-to-metal charge transfer spectra (Sundaram and Sandell, 1955;Droll et al, 1957;Schukarev et al, 1961;Jörgensen, 1962;Burger and Dyrssen, 1963;Biryukov and Shlenskaya, 1964a;Biryukov and Shlenskaya, 1964b;Burger, 1964a;Shlenskaya and Biryukov, 1964;Levanda, 1968;Rittner et al, 1970;Elding, 1972b;Tait et al, 1991). Spectrophotometric measurements of the homogeneous hydrolysis of aqueous palladium(II) (Byrne and Yao, 2000;Boily and Seward 2002) have, for instance, clearly shown the formation constant of PdCl 3 OH 2-to be several orders of magnitude different than a value proposed by solubility measurements (van Middlesworth and Wood, 1999).…”

Synthesis and coordination properties of highly preorganised polyamine macrocycles

“…Due to the high stability of the Hg(II) and Pd(II) complexes of polyammines L1, L3, competition between protonation of the free ligands and complex formation is not significant enough to derive the values of the stability constants, and competition with the formation of Hg(II) and Pd(II) chloro complexes was used. The stability constants for the formation of Hg(II) and Pd(II) chloro complexes were taken from references [27] and [28], respectively.…”