Complexing of Magnesium Ion by Fluoride Ion

Connick, Robert E.; Tsao, Maak-Sang

doi:10.1021/ja01650a015

Cited by 47 publications

(12 citation statements)

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“…The ion activities of the various species in the remineralisation solutions were determined from the filtrate calcium, phosphate and fluoride concentrations and the solution pH using an iterative computational procedure [Cai et al, 2007] [Gregory et al, 1970]; CaPO 4 -, 6.5 [Chughtai et al, 1968]; CaOH + , 1.3 [Davies and Hoyle, 1951]; HF 0 , 3.3 [Broene and deVries, 1947], and CaF + , 1.0 [Connick and Tsao, 1954]. The sources of the solubility products for the following solid phases were used: hydroxyapatite, 58.6 [McDowell et al, 1977]; fluorapatite, 60.2 [McCann, 1968]; octacalcium phosphate, 49.3 [Shyu et al, 1983]; brushite, 6.6 [Gregory et al, 1970]; fluorite, 10.5 [McCann, 1968]; ACP, 24.8 [Meyer and Eanes, 1978].…”

Section: Analysis Of Remineralisation Solutionsmentioning

confidence: 99%

Enamel Subsurface Lesion Remineralisation with Casein Phosphopeptide Stabilised Solutions of Calcium, Phosphate and Fluoride

et al. 2008

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Casein phosphopeptide stabilised amorphous calcium phosphate (CPP-ACP) and amorphous calcium fluoride phosphate (CPP-ACFP) solutions have been shown to remineralise enamel subsurface lesions. The aim of this study was to determine the effect of ion composition of CPP-ACP and CPP-ACFP solutions on enamel subsurface lesion remineralisation in vitro. CPP-bound and free calcium, phosphate and fluoride ion concentrations in the solutions were determined after ultrafiltration. The ion activities of the free ion species present were calculated using an iterative computational program. The mineral deposited in the subsurface lesions was analysed using transverse microradiography and electron microprobe. CPP was found to stabilise high concentrations of calcium, phosphate and fluoride ions at all pH values (7.0–4.5). Remineralisation of the subsurface lesions was observed at all pH values tested with a maximum at pH 5.5. The CPP-ACFP solutions produced greater remineralisation than the CPP-ACP solutions at pH 5.5 and below. The mineral formed in the subsurface lesions was consistent with hydroxyapatite and fluorapatite for remineralisation with CPP-ACP and CPP-ACFP, respectively. The activity gradient of the neutral ion pair CaHPO₄⁰ into the lesion was significantly correlated with remineralisation and together with HF⁰ were identified as important species for diffusion.

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Section: Analysis Of Remineralisation Solutionsmentioning

confidence: 99%

Enamel Subsurface Lesion Remineralisation with Casein Phosphopeptide Stabilised Solutions of Calcium, Phosphate and Fluoride

et al. 2008

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“…Hydrogen bonding interactions involving magnesium fluoride species are of relevance to the use of in situ generated [MgF 3 ] – to provide transition state analogues of phosphoryl transfer. 11 , 12 , 63 In this regard, indole is a useful probe for quantitative studies because, although it is a good hydrogen bond donor, it is neither a good hydrogen bond acceptor nor a good nitrogen donor ligand, 58 , 64 both of which would otherwise complicate the analysis. In this regard, Job plots 65 based on 1 H and 19 F NMR spectroscopic data demonstrate that the interaction between [Tp Bu t ,Me ]MgF and indole involves formation of a 1 : 1 adduct in benzene ( Scheme 4 and Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, structure and reactivity of a terminal magnesium fluoride compound, [Tp^But,Me]MgF: hydrogen bonding, halogen bonding and C–F bond formation

et al. 2016

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“…It Of the ions in the solution, it seems that only Mg++ would form considerable amounts of fluoride complexes. For the comparable medium 0.51f NaC104, Connick and Tsao (1954) give Mg++ + F-^MgF+, log K = 1.30 (25°), 1.20 (15°) Since log [Mg^"*"] = - 1.27, we would expect to have, in addition to the lO^'^-'^to lO'^-'^M of F~, an approximately equal concentration of MgF+, giving a total F concentration of 10~'^-^t o 10~'^-\ This is higher than the concentration found in sea water, 10~^-^"'3f, so it may not be worth while to look out for fluorspar in marine sediments. Probably most of the F is in silicate phases and some in the apatite (see below).…”

Section: Ironmentioning

confidence: 99%

Oceanography: Invited Lectures Presented at the International Oceanographic Congress Held in New York, 31 August-12 September 1959

Dunbar¹,

Sears²

1962

Geographical Review

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 208.95.48.254 on Tue, 26 Jan 2016 09:02:47 UTC All use subject to JSTOR Terms and Conditions GEOGRAPHICAL REVIEWS GEOGRAPHICAL REVIEWS higher training; "the manner in which the facts are presented has been determined by the systematic method of teaching geography in the Soviet schools." It is doubtful whether such a book will find its way into American universities as a text for students of the geography of the U.S.S.R. Both the detailed treatment and the price will preclude that.Professors Gershevsky and Williams have deleted the lengthy bibliography that accompanies each chapter in the Soviet editions but have retained at the end Suslov's list of general references. Readers will find the indexes most useful and the brief sketch of Professor Suslov's life in the Editor's Foreword (by the noted physical geographer A. G. Isachenko) interesting.-W. A. DOUGLAS JACKSON OCEANOGRAPHY: Invited Lectures Presented at the International Oceanographic Congress Held in New York, 31 August-12 September 1959. Edited by MARY SEARS. xi and 654 pp.; maps, diagrs., ills., bibliogrs., indexes. American Associationfor the Advancement of Science Publication No. 67, Washington, D. C., 1961. $14.75. 91 x 6 inches. The first International Oceanographic Congress was held in New York in September, 1959. The science of oceanography, here properly considered "a meeting place for all the sciences" (to quote Roger Revelle in the Preface), has come of age. Founded about the middle of the nineteenth century by such men as Matthew Fontaine Maury and Edward Forbes, pursued by growing numbers of specialists in the years following, the discipline has established the sea as a vitally important part of man's environment and has forced attention upon it from a world population consisting mainly of landlubbers. The oceanographers themselves are here looked upon as scientific sailors with an international citizenship, and this volume, it is to be hoped, marks the end of the period of which William S. Bruce complained in 1911: " . . . if an expedition investigates 150 miles of unknown land it is said to have made 'important geographical discoveries,' whereas, if it investigate, with equal if not greater detail, 150 miles of unknown sea, it will be said that the expedition made no geographical discoveries.' " This book contains thirty papers, of which fifteen are biological and fifteen physical, chemical, or geological. They are grouped into five sections: "History of the Oceans," "Populations of the Sea," "The Deep Sea," "Boundaries of the Sea," and "Cycles of Organic and Inorganic Substances in the Ocean." Some are reviews, some contain the results of new research. All of them are stimulating,...

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Complexing of Magnesium Ion by Fluoride Ion

Cited by 47 publications

References 3 publications

Enamel Subsurface Lesion Remineralisation with Casein Phosphopeptide Stabilised Solutions of Calcium, Phosphate and Fluoride

Enamel Subsurface Lesion Remineralisation with Casein Phosphopeptide Stabilised Solutions of Calcium, Phosphate and Fluoride

Synthesis, structure and reactivity of a terminal magnesium fluoride compound, [Tp^But,Me]MgF: hydrogen bonding, halogen bonding and C–F bond formation

Oceanography: Invited Lectures Presented at the International Oceanographic Congress Held in New York, 31 August-12 September 1959

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Complexing of Magnesium Ion by Fluoride Ion

Cited by 47 publications

References 3 publications

Enamel Subsurface Lesion Remineralisation with Casein Phosphopeptide Stabilised Solutions of Calcium, Phosphate and Fluoride

Enamel Subsurface Lesion Remineralisation with Casein Phosphopeptide Stabilised Solutions of Calcium, Phosphate and Fluoride

Synthesis, structure and reactivity of a terminal magnesium fluoride compound, [TpBut,Me]MgF: hydrogen bonding, halogen bonding and C–F bond formation

Oceanography: Invited Lectures Presented at the International Oceanographic Congress Held in New York, 31 August-12 September 1959

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Synthesis, structure and reactivity of a terminal magnesium fluoride compound, [Tp^But,Me]MgF: hydrogen bonding, halogen bonding and C–F bond formation