ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRapid planar-octahedral interconversion with nickel(II) complexesRalph G. Wilkins, Robert E. Yelin, Dale W. Margerum, and David C. WeatherburnCite this: J. Am. Chem. Soc. 1969, 91, 15, 4326Publication Date (Print):July 1, 1969Publication History Published online1 May 2002Published inissue 1 July 1969https://pubs.acs.org/doi/10.1021/ja01043a073https://doi.org/10.1021/ja01043a073research-articleACS PublicationsRequest reuse permissionsArticle Views124Altmetric-Citations26LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Abstract Die Macrocyclen (I) und (III) werden durch Kondensation entsprechender Tosylami‐ nokomponenten dargestellt und fallen in geringer Ausb. ( w 2090) und zusammen mit schwer abtrennbaren Nebenprodukten an.
Tetra- and penta-peptide complexes of NiII consume O2 in neutral solutions as the metal ion catalyses the oxidation of peptide to give a number of products including amides of amino-acids and of peptides, oxo-acids, and CO2.
[CoBr(C 12 H 29 N 5 )][ZnBr n ] cristallise dans P2 1 /n avec a=8,399, b=18,784 et c=14,688 A, β=103,12 o , Z=4; affinement jusqu'a R=0,033. La structure consiste en un cation Cd(III) octaedrique avec cinq azote du macrocycle et un ion Br − dans la sphere de coordination et un anion tetrabromozincate ordinaire
13 C N.m.r. spectroscopy has been used to investigate the protonation of 2,2,4-trimethyl-1,5,9-triazacyclododecane. The chemical shifts which occur upon protonation are interpreted as indicating that each protonation step results in the protonation of only one nitrogen atom, and that the sequence is probably N-5, N-9, and then N-1. There is some evidence indicating that a hydrogen bond is formed between N-1 and N-9 during the second protonation step. Chemical shifts observed are due to protonation of the nitrogen atom and to conformational changes within the molecule. The significance of these results for the determination of the protonation sequence of aliphatic polyamines is discussed.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
A method for achieving continuous high precision measurements of atmospheric O 2 is presented based on a commercially available fuel-cell instrument, (Sable Systems, Oxzilla FC-II) with a precision of 7 per meg (approximately equivalent to 1.2 ppm) for a 6-min measurement.The Oxzilla was deployed on two voyages in the Western Pacific sector of the Southern Ocean, in February 2003 and in April 2004, making these the second set of continuous O 2 measurements ever made from a ship.The results show significant temporal variation in O 2 , in the order of ±10 per meg over 6-hourly time intervals, and substantial spatial variation.Data from both voyages show an O 2 maximum centred on 50 • S, which is most likely to be the result of biologically driven O 2 outgassing in the region of subtropical convergence around New Zealand, and a decreasing O 2 trend towards Antarctica.O 2 from the ship-based measurements is elevated compared with measurements from the Scripps Institution of Oceanography flask-sampling network, and the O 2 maximum is also not captured in the network observations.This preliminary study shows that ship-based continuous measurements are a valuable addition to current fixed site sampling programmes for the understanding of ocean-atmosphere O 2 exchange processes.
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