The Crystal Structure of Tetrapyridine Copper(I) Perchlorate and Tetrapyridine Silver(I) Perchlorate at 260 K.

Nilsson, Karin; Oskarsson, Åke; Lund, P.-A.; Shen, Quang; Weidlein, Johan; Spiridonov, V. P.; Strand, T. G.

doi:10.3891/acta.chem.scand.36a-0605

Cited by 92 publications

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“…For ␣-amino acids that contain alkyl sidechains, such as valine, leucine and isoleucine, their relative silver(I) ion binding energies are smaller than their corresponding copper(I) ion binding energies. This observation is in accordance with the longer Ag(I)-N bond relative to the Cu(I)-N bond, which makes the inductive effect of the alkyl sidechain less effective for the silver-containing complexes [41][42][43][44]. For the two amino acids that contain carboxylate sidechains, aspartic and glutamic acid, their relative silver(I) ion binding energies are also smaller than their corresponding copper(I) ion binding energies; the silver(I) ion is a softer Lewis acid than the copper(I) ion, and hence will bind less strongly to hard bases, such as the oxygen sites on the sidechain carboxylic group [45][46][47].…”

Section: Resultssupporting

confidence: 55%

“…For amino acids that contain nitrogen-bearing sidechains, i.e., histidine, tryptophan, glutamine, and asparagine; aromatic sidechains, i.e., tryptophan, tyrosine, and phenylalanine; and sulfurbearing sidechain, i.e., methionine; their relative silver(I) ion binding energies are larger than their corresponding copper(I) ion binding energies. This effect is likely due to more favorable binding because of Ag(I)'s larger size [41][42][43][44] and softer properties relative to Cu(I) [45][46][47]. Figure 4 shows the correlation between relative silver(I) ion binding energies and relative proton basicities.…”

Section: Resultsmentioning

confidence: 99%

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Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method

Lee

Lau

et al. 1998

J. Am. Soc. Mass Spectrom.

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The relative silver(I) ion binding energies of 19 ␣-amino acids have been measured by means of the kinetic method. In general, they are similar to the relative copper(I) ion binding energies of corresponding amino acids although there are differences that can be accounted for by differences in silver(I) and copper(I) chemistry. The correlation with proton basicities is comparatively poorer. Again, the differences between silver(I) and proton binding can be attributed to differences in silver(I) and proton chemistry. The relative silver(I) binding energies measured are best described as relative basicities or ⌬⌬G°A g 's. The observed internal consistency during construction of a silver(I) ion basicity ladder implies that ⌬⌬S°A g is approximately zero except when histidine and lysine are involved. For 16 ␣-amino acids, their relative silver(I) ion basicities Ϸ relative silver(I) ion affinities or ⌬⌬G°A g Ϸ ⌬⌬H°A g . (J Am Soc Mass Spectrom 1998, 9, 760 -766) © 1998 American Society for Mass Spectrometry T he bio-inorganic chemistry of the silver(I) ion is rich and fascinating. The silver(I) ion has long been used as a bactericide in the form of eye drops for newborns [1,2]. Some of its complexes display remarkable antimicrobial activities [3,4]. The metallothioneins, a class of small proteins believed to be responsible for heavy-metal detoxification in mammals, exhibit very high affinity for Ag(I) [5][6][7]. The silver(I) ion binds relatively strongly to peptides and proteins; collision-induced dissociation of these complexes in the gas phase yields abundant Ag(I)-bound product ions [8].We report in this article the first measurement of the relative gas-phase silver(I) ion binding energies of 19 essential ␣-amino acids. Measurements of gas-phase binding energies, especially affinities, of biological ligands for small ions, including protons [9 -23], alkalimetal ions [24], and recently Cu(I) [25], are often made with the desire to know the fundamental, intrinsic binding in the absence of water-an environment which approximates that in the interior of proteins. The kinetic method, developed by Cooks and co-workers [26 -30], is a particularly effective method for measuring relative ion binding energies of amino acids and peptides because it does not require generating a population of nonvolatile neutral ligands in the gas phase. It is based on measuring the logarithm of the relative abundance of the product ions arising from the dissociation of an ion-bound heterodimer of the ligands, which is proportional to the logarithm of the relative rate of dissociation of the two reaction channels, to estimate the relative binding energies of the two ligands for the ion:where M is the central ion, B i is a reference base whose binding energy to M is known, and B is the unknown base whose binding energy is being measured. AccordAddress reprint requests to Dr.

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method

Lee

Lau

et al. 1998

J. Am. Soc. Mass Spectrom.

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“…A few examples are complexes formed with bipyridine derivatives, [10] thiocyanate, [11] adiponitriles, [12] pyridines [13,14] and indole-containing ligands. [15] In rare cases, Cu I can have other coordination environments, including linear, [1] trigonal, [1] and trigonal pyramidal.…”

Section: Introductionmentioning

confidence: 99%

The Chelating Ligand 1,3‐Bis(pyrazol‐1′‐yl)propane (Bpp) Enforces a Tetrahedral Geometry in Both Cu^II and Cu^I Species

et al. 2003

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The ligand 1,3-bis(pyrazol-1Ј-yl)propane (bpp) has been prepared by reacting 1,3-dichloropropane with two equivalents of pyrazole. After reaction of bpp with copper(II) tetrafluoroborate, three different compounds were obtained, two with Cu II and one with Cu I as cation, depending on the preparative method. The formation of single crystals of these compounds was only observed when 1-(3-chloropropyl)pyrazole (ppc) was present in the solution. The single-crystal X-ray structures of [Cu(bpp)

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“…Dagegen ist die quadratisch-antiprismatische Koordination, wie sie für Cd 2 Mo(CN) 8 8 [28], als auch im festen Zustand (226 pm) [29] gefunden. Von weiteren Silberverbindungen mit der gegenüber Stickstoff relativ seltenen Tetraederkoordination werden vergleichbare mittlere Abstände zwischen 227 und 232 pm berichtet [30,31]. Beim Übergang zu planarer Viererkoordination fallen die Werte noch größer aus [32,33] …”

Section: Introductionunclassified

Kristallstrukturen von Octacyanomolybdaten(IV), I Ag₄(NH₃)₅Mo(CN)₈ · 1,5 H₂O

Meske

Babel

1988

Zeitschrift Für Naturforschung B

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The crystal structure of the triclinic compound Ag4(NH3)5Mo(CN)8- 1,5H2O could be refined in space group P1̄ (at T = 179 K: a = 974.6, b = 1477.6, C = 775.5 pm, α = 102.5, β = 94.6, y = 81.5°, Z = 2. Rg = 0.044 for 2744 independent reflections). The [Mo(CN)8]4_-groups form distorted square antiprisms with mean distances Mo-C = 215.7, C-N = 115.1 pm. They are connected to a puckered layer via four of their nitrogen ends which are tetrahedrally coordinated to silver (Ag-N = 226.7 pm). In between these layers and more or less tightly coordinated to their free cyano-N atoms dumbbells [CNAgNH3] and [Ag(NH3)2]+ are embedded. Their variation of distances and angles (Ag-N: 213 ... 216 pm, N-Ag-N: 150 ... 174°) is discussed.

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The Crystal Structure of Tetrapyridine Copper(I) Perchlorate and Tetrapyridine Silver(I) Perchlorate at 260 K.

Cited by 92 publications

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Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method

Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method

The Chelating Ligand 1,3‐Bis(pyrazol‐1′‐yl)propane (Bpp) Enforces a Tetrahedral Geometry in Both Cu^II and Cu^I Species

Kristallstrukturen von Octacyanomolybdaten(IV), I Ag₄(NH₃)₅Mo(CN)₈ · 1,5 H₂O

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The Crystal Structure of Tetrapyridine Copper(I) Perchlorate and Tetrapyridine Silver(I) Perchlorate at 260 K.

Cited by 92 publications

References 0 publications

Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method

Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method

The Chelating Ligand 1,3‐Bis(pyrazol‐1′‐yl)propane (Bpp) Enforces a Tetrahedral Geometry in Both CuII and CuI Species

Kristallstrukturen von Octacyanomolybdaten(IV), I Ag4(NH3)5Mo(CN)8 · 1,5 H2O

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The Chelating Ligand 1,3‐Bis(pyrazol‐1′‐yl)propane (Bpp) Enforces a Tetrahedral Geometry in Both Cu^II and Cu^I Species

Kristallstrukturen von Octacyanomolybdaten(IV), I Ag₄(NH₃)₅Mo(CN)₈ · 1,5 H₂O