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• W2065517526 endingPage "10131" @default.
• W2065517526 startingPage "10131" @default.
• W2065517526 abstract "A new class of macrocyclic ligands based on 1-oxa-4,7-diazacyclononane was synthesized and their Mn(2+) complexes were investigated with respect to stability and relaxation properties. Each ligand has two pendant arms involving carboxylic (H(2)L(1)--1-oxa-4,7-diazacyclononane-4,7-diacetic acid), phosphonic (H(4)L(2)--1-oxa-4,7-diazacyclononane-4,7-bis(methylenephosphonic acid)), phosphinic (H(2)L(3)--1-oxa-4,7-diazacyclononane-4,7-bis(methylenephosphinic acid)) or phenylphosphinic (H(2)L(4)--1-oxa-4,7-diazacyclononane-4,7-bis[methylene(phenyl)phosphinic acid]) acid moieties. H(2)L(3) and H(2)L(4) were synthesized for the first time. The crystal structure of the Mn(2+) complex with H(2)L(4) confirmed a coordination number of 6 for Mn(2+). The protonation constants of all ligands and the stability constants of their complexes with Mn(2+) and some biologically or biomedically relevant metal ions were determined by potentiometry. The protonation sequence of H(2)L(3) was followed by (1)H and (31)P NMR titration and the second protonation step was attributed to the second macrocyclic nitrogen atom. The potentiometric data revealed a relatively low thermodynamic stability of the Mn(2+) complexes with all ligands investigated. For H(2)L(3) and H(2)L(4), full Mn(2+) complexation cannot be achieved even with 100% ligand excess. The transmetallation of MnL(1) and MnL(2) with Zn(2+) was too fast to be followed at pH 6. Variable temperature (1)H NMRD and (17)O NMR measurements have been performed on MnL(1) and MnL(2) to provide information on water exchange and rotational dynamics. The (17)O chemical shifts indicate hydration equilibrium between mono- and bishydrated species for MnL(1), while MnL(2) is monohydrated. The water exchange is considerably faster on MnL(1) (k(ex)(298) = 1.2 × 10(9) s(-1)) than on MnL(2) (k(ex)(298) = 1.2 × 10(7) s(-1)). Small endogenous anions (phosphate, carbonate, citrate) do not replace the coordinated water in either of the complexes, but they induce their slow decomposition. All Mn(2+) complexes are stable toward air-oxidation." @default.
• W2065517526 created "2016-06-24" @default.
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• W2065517526 date "2011-01-01" @default.
• W2065517526 modified "2023-10-07" @default.
• W2065517526 title "Mn2+ complexes of 1-oxa-4,7-diazacyclononane based ligands with acetic, phosphonic and phosphinic acid pendant arms: Stability and relaxation studies" @default.
• W2065517526 cites W1539796472 @default.
• W2065517526 cites W1964969723 @default.
• W2065517526 cites W1965366745 @default.
• W2065517526 cites W1966231686 @default.
• W2065517526 cites W1969843670 @default.
• W2065517526 cites W1970347408 @default.
• W2065517526 cites W1971476134 @default.
• W2065517526 cites W1971699234 @default.
• W2065517526 cites W1979401575 @default.
• W2065517526 cites W1985305470 @default.
• W2065517526 cites W1986959931 @default.
• W2065517526 cites W1988692691 @default.
• W2065517526 cites W1989226016 @default.
• W2065517526 cites W1993362148 @default.
• W2065517526 cites W1995701960 @default.
• W2065517526 cites W1995809573 @default.
• W2065517526 cites W1996234823 @default.
• W2065517526 cites W2000408559 @default.
• W2065517526 cites W2002700282 @default.
• W2065517526 cites W2004012405 @default.
• W2065517526 cites W2006150591 @default.
• W2065517526 cites W2007613643 @default.
• W2065517526 cites W2007959364 @default.
• W2065517526 cites W2010980394 @default.
• W2065517526 cites W2012052836 @default.
• W2065517526 cites W2018257496 @default.
• W2065517526 cites W2019446780 @default.
• W2065517526 cites W2019925713 @default.
• W2065517526 cites W2020519256 @default.
• W2065517526 cites W2020623316 @default.
• W2065517526 cites W2026665418 @default.
• W2065517526 cites W2027290537 @default.
• W2065517526 cites W2028103649 @default.
• W2065517526 cites W2032762674 @default.
• W2065517526 cites W2032891327 @default.
• W2065517526 cites W2033503179 @default.
• W2065517526 cites W2033614437 @default.
• W2065517526 cites W2038528478 @default.
• W2065517526 cites W2040209721 @default.
• W2065517526 cites W2041049135 @default.
• W2065517526 cites W2042357537 @default.
• W2065517526 cites W2044676806 @default.
• W2065517526 cites W2046114168 @default.
• W2065517526 cites W2046708541 @default.
• W2065517526 cites W2047044382 @default.
• W2065517526 cites W2047643456 @default.
• W2065517526 cites W2051268524 @default.
• W2065517526 cites W2052479523 @default.
• W2065517526 cites W2053806446 @default.
• W2065517526 cites W2069648693 @default.
• W2065517526 cites W2070881094 @default.
• W2065517526 cites W2070898641 @default.
• W2065517526 cites W2071918424 @default.
• W2065517526 cites W2074532371 @default.
• W2065517526 cites W2075321475 @default.
• W2065517526 cites W2076283593 @default.
• W2065517526 cites W2081632715 @default.
• W2065517526 cites W2086271228 @default.
• W2065517526 cites W2087693812 @default.
• W2065517526 cites W2089355691 @default.
• W2065517526 cites W2089750873 @default.
• W2065517526 cites W2090871852 @default.
• W2065517526 cites W2092298774 @default.
• W2065517526 cites W2093400000 @default.
• W2065517526 cites W2101979321 @default.
• W2065517526 cites W2109669266 @default.
• W2065517526 cites W2117405777 @default.
• W2065517526 cites W2117924441 @default.
• W2065517526 cites W2125455353 @default.
• W2065517526 cites W2138583842 @default.
• W2065517526 cites W2142993696 @default.
• W2065517526 cites W2146520138 @default.
• W2065517526 cites W2157452321 @default.
• W2065517526 cites W2162675800 @default.
• W2065517526 cites W2163309352 @default.
• W2065517526 cites W2949262246 @default.
• W2065517526 cites W2950567082 @default.
• W2065517526 cites W3022316311 @default.
• W2065517526 doi "https://doi.org/10.1039/c1dt10543d" @default.
• W2065517526 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21887440" @default.
• W2065517526 hasPublicationYear "2011" @default.
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