Magnetic Resonance Studies of Ion Solvation. The Coordination Number of Gallium(III) Ions in Aqueous Solutions

Variable‐Temperature and Variable‐Pressure17O‐NMR Study of Water Exchange of Hexaaquaaluminium(III)

“…Until now, the dissociative character of H,O exchange on Al(H,O)P lay only on the large, positive AS* [6], and we have also found a positive AS*. However, AS* is not an infallible mechanistic indicator [20], and A V should provide more precise information.…”

“…The discrepancies between the 3 sets of parameters stemming from variable-temperature measurements can easily be explained. Fiat and Connick [6] determined the kinetic line-broadening of the "0-NMR signal of the coordinated H,O, using the Co(I1) ion as paramagnetic shift reagent for the overlapping bulk-H,O signal. Since the Co(I1) induced chemical shift is not sufficiently large at high temperatures, they only had access to part of the line-broadening chemical-exchange domain available in the present study where Mn(I1) is used as relaxation reagent for the bulk H,O.…”

Oxygen-17 NMR spectroscopy: Basic principles and applications (Part I)

“…Copyright 1955, American Institute of Physics.) been investigated by Taube and collaborators [42] and Connick and Fiat [43][44][45]. Structural studies of polyoxoanions of the early transition metals were initiated by Klemperer et al [2,5,[46][47][48] in the middle 1970s and quantitative assessment of steric perturbation of organic molecules by Boykin and collaborators [6,25,[49][50][51] in the middle 1980s.…”

Design and properties of novel gallium-doped injectable apatitic cements

“…52 53 54 55 1. Introduction 56 The use of synthetic calcium phosphate-based bone substitutes 57 in human bone surgery is continuously expanding [1][2][3][4][5][6]. These 58 bioactive implants have the unique capacity to be resorbed 59 in vivo according to bone remodeling kinetics and replaced by 60 natural bone.…”

“…144 The pH of the solution was adjusted in the 9-9.5 range by means ity of soluble gallium species in solution. In strongly acidic solu-289 tions, the solubility limit is 10 À2 mol L À1 below pH 2, with 290 gallium present as octahedral hexa-aqua complexes [57,58]. In 291 basic medium, gallium is present as Ga(OH) 4 À gallate ions with a 292 solubility limit of 10 À3.3 mol L À1 at pH 10 [59,60].…”