Palladium(II) halide complexes. I. Stabilities and spectra of palladium(II) chloro and bromo aqua complexes

Elding, Lars Ivar

doi:10.1016/s0020-1693(00)91874-7

Cited by 207 publications

(130 citation statements)

References 10 publications

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“…17 [1][2][3]8,18 Therefore, concentrated perchloric and nitric acids were used as the noncomplexing and the most complexing medium, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…A highly acid mixture of HClO 4 / HNO 3 is necessary to avoid precipitation risk and to limit hydrolysis in order to characterize equilibrium between pure Pd(H 2 O) 4 2+ aqua ions and mixed Pd(NO 3 )(H 2 O) 3 + , Pd(NO 3 ) 2 -(H 2 O) 2 , and Pd(NO 3 ) 3 (H 2 O) -nitrate complexes. [1][2][3] Only [Pt(H 2 O) 4 ] 2+ , which can be taken as an analogue of [Pd(H 2 O) 4 ] 2+ , has been characterized by XAFS (X-ray absorption fine structure) technique. 5,6 Note that the LAXS (largeangle X-ray scattering) technique requires too high concentrations and long exposure times to be applicable to the solutions of the hydrated cations available.…”

Section: Introductionmentioning

confidence: 99%

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Structural Investigation of Pd(II) in Concentrated Nitric and Perchloric Acid Solutions by XAFS

et al. 2005

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XAFS spectra of palladium (II) 2+ square-planar aqua ion in strong perchloric acid, the use of an FEFF6 theoretical approach led to a first-shell Pd-O w distance of 2.00 (1) Å and a Debye-Waller (DW) factor of σ 2 ) 0.0030 (3) Å 2 . Four water molecules are tightly bound to the Pd 2+ ion in the equatorial plane, while two (or one) axial water molecules are weakly bound to the metal ion at 2.5 Å with a DW factor of 0.015 (5) Å 2 . For highly concentrated mixtures (4-6 M HNO 3 ) and for pure concentrated (4-6 M) nitric acid as well as for crystalline powder Pd(NO 3 ) 2 (H 2 O) 2 , the XAFS spectra are very similar and are determined by the mixed nitric complex Pd(NO 3 ) 2 (H 2 O) 2 : four Pd-O near-equivalent distances of 2.01 (1) Å from two H 2 O and two NO 3 molecules with a total DW factor of σ 2 ) 0.0037 (3) Å 2 . Moreover, two Pd---N distances of 2.8-2.9 Å were determined in the second coordination shell.

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“…17 [1][2][3]8,18 Therefore, concentrated perchloric and nitric acids were used as the noncomplexing and the most complexing medium, respectively.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural Investigation of Pd(II) in Concentrated Nitric and Perchloric Acid Solutions by XAFS

et al. 2005

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“…The formation constants of complexes and their equilibrium concentrations were calculated using the PSEQUAD program [13] from the data of EASs and pH of equilibrium solutions from the formulas: 2-= 11.54 (I = 1 mol/l HClO 4 + NaClO 4 , T = 25 °C) [14]. All measurements were carried out a day after the preparation of solutions, the period required for the establishment of chemical equilibrium.…”

Section: Methodsmentioning

confidence: 99%

Complexes of palladium(II) with 1-phenyl-1-hydroxymethylene bisphosphoniс acid and their antitumor activity

Kozachkova¹,

Tsaryk²,

TRACHEVSKYI³

et al. 2017

Ukr.Biochem.J.

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complex formation of K 2 [Pdcl 4 ] with 1-phenyl-1-hydroxymethylene bisphosphonic acid (PhhMBP, h 4 K e y w o r d s: palladium(II) complexes, bisphosphonic acid, cytotoxic activity, toxicity.C isplatin is still one of the most famous and efficient anticancer drugs used in the clinical practice [1]. Nevertheless, searching for new compounds with antineoplastic action continues to eliminate the serious side effects, to improve the clinical efficacy and to broaden the antitumor spectrum. In particular, palladium(II) bisphosphonates are promising species for the treatment of bone cancer and metastases: complexes include a cytotoxic metal (palladium) and a bisphosphonic acid, which possesses affinity for bone tissue and can ensure targeted delivery of the cytotoxic metal to the lesion site [2][3][4][5][6][7][8][9]. The P-C-P moiety present in bisphospho nic acids provides their active link to the bone matrix, and two side substituents determine their physicochemical and pharmacologic properties. To study the effect of the structure of complex and chemical nature of the substituents bonded to the carbon atom of bisphosphonate moiety on the biological activity, the formation of palladium(II) complexes with 1-phenyl-1-hydroxymethylene bisphosphoniс acid was investigated, which, besides two phosphonic groups, contain a hydroxy group and a phenyl moiety.

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“…Palladous chloride [22] is insoluble in aqueous solution but it is dissolved in the presence of Cl -. Elding [23] Pd + 4Cl…”

Section: Methodsmentioning

confidence: 99%

A Kinetic and Mechanistic Study of Palladium (II) Catalysed Oxidation of Arginine by Cerium (IV) in Acid Media

Raj¹

2015

IJIRSET

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Kinetics of palladium(II) catalysed oxidation of arginine has been studied by Ce(IV) in acidic medium at 45°C. The reaction show first order kinetics with respect to Ce(IV) and Pd(II) in the oxidation of arginine. The first order kinetics with respect to arginine obtained at its lower concentration changes to zero order at its higher concentration. It is found that pseudo first order rate constant, k obs decreases with increase of [HSO 4 -] and increases with the increase of [H + ]. Various activation parameters have been calculated with the pseudo first order rate constant values observed at three different temperatures. A plausible mechanism has been proposed from the results of kinetic studies, reaction stoichiometry and product analysis.

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Palladium(II) halide complexes. I. Stabilities and spectra of palladium(II) chloro and bromo aqua complexes

Cited by 207 publications

References 10 publications

Structural Investigation of Pd(II) in Concentrated Nitric and Perchloric Acid Solutions by XAFS

Structural Investigation of Pd(II) in Concentrated Nitric and Perchloric Acid Solutions by XAFS

Complexes of palladium(II) with 1-phenyl-1-hydroxymethylene bisphosphoniс acid and their antitumor activity

A Kinetic and Mechanistic Study of Palladium (II) Catalysed Oxidation of Arginine by Cerium (IV) in Acid Media

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