Preparation and characterization of rhodium(III) polyphosphate complexes

Lin, Irene; Knight, Wilson B.; Ting, Su Jen; Dunaway‐Mariano, Debra

doi:10.1021/ic00175a039

Cited by 19 publications

(16 citation statements)

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“…After about 6 h, the peaks begin to shift to higher wavenumbers. The spectra stop changing after 24 h and match the spectra of a pure solution of [Rh(H 2 PO 4 ) 2 (H 2 O) 4 ] + , as reported by Lin et al (1984) [17] (Fig. 9).…”

Section: Solution Speciation Of Rh(iii)supporting

confidence: 81%

“…This result suggests that the Rh(III)-phosphate complex in the aged growth solutions is also [Rh(H 2 PO 4 ) 2 (H 2 O) 4 ] + at pH 4.2. Correspondingly, 31 P NMR spectra of the Rh(III)/ PO 4 = 0.5 has a peak at 15.8 ppm as reported for [Rh(H 2 PO 4 ) 2 (H 2 O) 4 ] +[17].…”

supporting

confidence: 68%

“…The only published UV-vis spectra of Rh(III)-phosphate complexes were reported by Lin et al (1984) [17] and Cervini et al (1991) [19]. While these spectra were helpful, a more quantitative technique was needed.…”

Section: Solution Speciation Of Rh(iii)mentioning

confidence: 99%

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Molecular properties of adsorbates that affect the growth kinetics of archerite (KDP)

Thomas¹,

Land²,

Johnson³

et al. 2004

Journal of Colloid and Interface Science

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Section: Solution Speciation Of Rh(iii)supporting

confidence: 81%

supporting

confidence: 68%

See 1 more Smart Citation

Molecular properties of adsorbates that affect the growth kinetics of archerite (KDP)

Thomas¹,

Land²,

Johnson³

et al. 2004

Journal of Colloid and Interface Science

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“…Evidence also exists for the formation of a tridentate triphosphate Rh(III) complex from NMR spectroscopy and HPLC. 55 The triphosphate moiety is coordinated in a facial fashion, analogous to the structure proposed here.…”

Section: Discussionmentioning

confidence: 75%

Two-Dimensional (2D) Pulsed Electron Paramagnetic Resonance Study of VO²⁺−Triphosphate Interactions: Evidence for Tridentate Triphosphate Coordination, and Relevance To Bone Uptake and Insulin Enhancement by Vanadium Pharmaceuticals

2002

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Two- and four-pulse electron spin echo envelope modulation (ESEEM) and four-pulse two-dimensional hyperfine sublevel correlation (HYSCORE) spectroscopies have been used to determine the solution structure of a 3:1 triphosphate:vanadyl solution at pH 5.0. Limited quantitative data were extracted from the two pulse spectra; however, HYSCORE proved to be more useful in the detection and interpretation of the (31)P and (1)H couplings. Three sets of cross-peaks were observed for each nucleus. For the (31)P couplings, three sets of cross-peaks were observed in the HYSCORE spectrum, and contour line shape analysis yielded coupling constants of approximately 15, 9, and 1 MHz. HYSCORE cross-peaks in the proton region were partially overlapping; however, interpretation of the proton coupling was simplified through the use of one-dimensional four-pulse ESEEM and subsequent analysis of the sum combination peaks. Comparison of the derived isotropic and anisotropic coupling constants with results from earlier ESEEM and electron nuclear double resonance (ENDOR) studies was consistent with the presence of at least one, and most likely two, water molecules coordinated in the equatorial plane of the vanadyl cation. The vanadyl-triphosphate system was shown to be an accurate model of the in vivo vanadyl-phosphate coupling constants determined in an earlier study (Dikanov, S. A.; Liboiron, B. D.; Thompson, K. H.; Vera, E.; Yuen, V. G.; McNeill, J. H.; Orvig, C. J. Am. Chem. Soc. 1999, 121, 11004.) Comparison of these values to those found in previous spectroscopic studies of vanadyl-triphosphate interactions, along with a detailed structural interpretation, are presented. This work represents the first detection of tridentate polyphosphate coordination to the vanadyl ion, and the first observation of an axial phosphate interaction not previously reported in earlier ENDOR and pulsed electron paramagnetic resonance studies.

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“…The A and A isomers of C O ( N H~)~A T P were separated according to Cornelius and Cleland [17]. Rh(H,O),ATP was prepared from a solution of [Rh(H20),](CI04), and ATP by the procedure of Lin et al [18]. Heating of the compounds for 2 min at 80°C gave, after purification, yields of about 80% Rh(H20)4ATP (bidentate) and about 20% Rh(H20)3ATP (tridentate).…”

Section: Preparation Of Mgatp Complex Analoguesmentioning

confidence: 99%

How do MgATP analogues differentially modify high‐affinity and low‐affinity ATP binding sites of Na⁺/K⁺ ‐ATPase?

Serpersu

Bunk

Schoner

1990

European Journal of Biochemistry

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The exchange-inert tetra-ammino-chromium complex of ATP [Cr(NH3)4ATP], unlike the analogous cobalt complex CO(NH,)~ATP, inactivated Na + /K + -ATPase slowly by interacting with the high-affinity ATP binding .site. The inactivation proceeded at 37°C with an inactivation rate constant of 1.34 x lo-, min-' and with a dissociation constant of 0.62 pM. To assess the potential role of the water ligands of metal in binding and inactivation, a kinetic analysis of the inactivation of Na +/K +-ATPase by Cr(NH,),ATP, and its H20-substituted derivatives Cr(NH3),(H20)ATP, Cr(NH3)2(H20)zATP and Cr(H20)4ATP was carried out. The substitution of the H 2 0 ligands with NH3 ligands increased the apparent binding affinity and decreased the inactivation rate constants of the enzyme by these complexes. Inactivation by Cr(H20),ATP was 29-fold faster than the inactivation by Cr(NH3)4ATP. These results suggested that substitution to Cr(II1) occurs during the inactivation of the enzyme. Additionally hydrogen bonding between water ligands of metal and the enzyme's active-site residues does not seem to play a significant role in the inactivation of Naf/K+-ATPase by Cr(II1)-ATP complexes.Inactivation of the enzyme by Rh(HzO),ATP occurred by binding of this analogue to the high-affinity ATP site with an apparent dissociation constant of 1.8 pM. The observed inactivation rate constant of 2.11 x min-' became higher when Na' or Mg2+ or both were present. The presence of K f however, increased the dissociation constant without altering the inactivation rate constant. High concentrations of Na' reactivated the Rh(HzO),ATP-inactivated enzyme.Co (

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Preparation and characterization of rhodium(III) polyphosphate complexes

Cited by 19 publications

References 0 publications

Molecular properties of adsorbates that affect the growth kinetics of archerite (KDP)

Molecular properties of adsorbates that affect the growth kinetics of archerite (KDP)

Two-Dimensional (2D) Pulsed Electron Paramagnetic Resonance Study of VO²⁺−Triphosphate Interactions: Evidence for Tridentate Triphosphate Coordination, and Relevance To Bone Uptake and Insulin Enhancement by Vanadium Pharmaceuticals

How do MgATP analogues differentially modify high‐affinity and low‐affinity ATP binding sites of Na⁺/K⁺ ‐ATPase?

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Preparation and characterization of rhodium(III) polyphosphate complexes

Cited by 19 publications

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Molecular properties of adsorbates that affect the growth kinetics of archerite (KDP)

Molecular properties of adsorbates that affect the growth kinetics of archerite (KDP)

Two-Dimensional (2D) Pulsed Electron Paramagnetic Resonance Study of VO2+−Triphosphate Interactions: Evidence for Tridentate Triphosphate Coordination, and Relevance To Bone Uptake and Insulin Enhancement by Vanadium Pharmaceuticals

How do MgATP analogues differentially modify high‐affinity and low‐affinity ATP binding sites of Na+/K+ ‐ATPase?

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Two-Dimensional (2D) Pulsed Electron Paramagnetic Resonance Study of VO²⁺−Triphosphate Interactions: Evidence for Tridentate Triphosphate Coordination, and Relevance To Bone Uptake and Insulin Enhancement by Vanadium Pharmaceuticals

How do MgATP analogues differentially modify high‐affinity and low‐affinity ATP binding sites of Na⁺/K⁺ ‐ATPase?