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• W1972685725 endingPage "2637" @default.
• W1972685725 startingPage "2626" @default.
• W1972685725 abstract "The self-assembly between a water-soluble bis-bidentate ligand L18w and Co(II) salts in water affords three high-spin Co(II) products: a dinuclear meso-helicate [Co2(L18w)3]X4; a tetrahedral cage [Co4(L18w)6]X8; and a dodecanuclear truncated-tetrahedral cage [Co12(L18w)18]X24 (X = BF4 or ClO4). All three products were crystallized under different conditions and structurally characterized. In [Co2(L18w)3]X4 all three bridging ligands span a pair of metal ions; in the two larger products, there is a metal ion at each vertex of the Co4 or Co12 polyhedral cage array with a bridging ligand spanning a pair of metal ions along every edge. All three structural types are known: what is unusual here is the presence of all three from the same reaction. The assemblies Co2, Co4, and Co12 are in slow equilibrium (hours/days) in aqueous solution, and this can be conveniently monitored by 1H NMR spectroscopy because (i) the paramagnetism of Co(II) disperses the signals over a range of ca. 200 ppm and (ii) the different symmetries of the three species give characteristically different numbers of independent 1H NMR signals, which makes identification easy. From temperature- and concentration-dependent 1H NMR studies it is clear that increasing temperature and increasing dilution favors fragmentation to give a larger proportion of the smaller assemblies for entropic reasons. High concentrations and low temperature favor the larger assembly despite the unfavorable entropic and electrostatic factors associated with its formation. We suggest that this arises from the hydrophobic effect: reorganization of several smaller complexes into one larger one results in a smaller proportion of the hydrophobic ligand surface being exposed to water, with a larger proportion of the ligand surface protected in the interior of the assembly. In agreement with this, 1H NMR spectra in a nonaqueous solvent (MeNO2) show formation of only [Co2(L18w)3]X4 because the driving force for reorganization into larger assemblies is now absent. Thus, we can identify the contributions of temperature, concentration, and solvent on the result of the metal/ligand self-assembly process and have determined the speciation behavior of the Co2/Co4/Co12 system in aqueous solution." @default.
• W1972685725 created "2016-06-24" @default.
• W1972685725 creator A5009368219 @default.
• W1972685725 creator A5064693777 @default.
• W1972685725 creator A5079302315 @default.
• W1972685725 date "2015-02-20" @default.
• W1972685725 modified "2023-10-06" @default.
• W1972685725 title "An Interconverting Family of Coordination Cages and a <i>meso</i>-Helicate; Effects of Temperature, Concentration, and Solvent on the Product Distribution of a Self-Assembly Process" @default.
• W1972685725 cites W1878328929 @default.
• W1972685725 cites W1965743698 @default.
• W1972685725 cites W1967743796 @default.
• W1972685725 cites W1967964434 @default.
• W1972685725 cites W1968345390 @default.
• W1972685725 cites W1968640067 @default.
• W1972685725 cites W1971775718 @default.
• W1972685725 cites W1972121438 @default.
• W1972685725 cites W1978618502 @default.
• W1972685725 cites W1981019220 @default.
• W1972685725 cites W1984903816 @default.
• W1972685725 cites W1991006632 @default.
• W1972685725 cites W1991860687 @default.
• W1972685725 cites W1996307089 @default.
• W1972685725 cites W1996788294 @default.
• W1972685725 cites W1998011476 @default.
• W1972685725 cites W2006935156 @default.
• W1972685725 cites W2008805288 @default.
• W1972685725 cites W2009046603 @default.
• W1972685725 cites W2009587949 @default.
• W1972685725 cites W2011879584 @default.
• W1972685725 cites W2012787172 @default.
• W1972685725 cites W2016737521 @default.
• W1972685725 cites W2018629314 @default.
• W1972685725 cites W2020227265 @default.
• W1972685725 cites W2021438407 @default.
• W1972685725 cites W2022017323 @default.
• W1972685725 cites W2024220472 @default.
• W1972685725 cites W2025860914 @default.
• W1972685725 cites W2030605912 @default.
• W1972685725 cites W2031876508 @default.
• W1972685725 cites W2046680280 @default.
• W1972685725 cites W2047115921 @default.
• W1972685725 cites W2048631643 @default.
• W1972685725 cites W2049628910 @default.
• W1972685725 cites W2050564345 @default.
• W1972685725 cites W2051477678 @default.
• W1972685725 cites W2055948489 @default.
• W1972685725 cites W2059205366 @default.
• W1972685725 cites W2065273366 @default.
• W1972685725 cites W2066454032 @default.
• W1972685725 cites W2069292133 @default.
• W1972685725 cites W2069493628 @default.
• W1972685725 cites W2074944056 @default.
• W1972685725 cites W2085633310 @default.
• W1972685725 cites W2086868899 @default.
• W1972685725 cites W2087071016 @default.
• W1972685725 cites W2087571702 @default.
• W1972685725 cites W2096581614 @default.
• W1972685725 cites W2100300640 @default.
• W1972685725 cites W2108633598 @default.
• W1972685725 cites W2109429762 @default.
• W1972685725 cites W2116244304 @default.
• W1972685725 cites W2121701557 @default.
• W1972685725 cites W2123256969 @default.
• W1972685725 cites W2131305297 @default.
• W1972685725 cites W2131306369 @default.
• W1972685725 cites W2131350133 @default.
• W1972685725 cites W2131910659 @default.
• W1972685725 cites W2132682133 @default.
• W1972685725 cites W2145647599 @default.
• W1972685725 cites W2148297848 @default.
• W1972685725 cites W2152079199 @default.
• W1972685725 cites W2154019687 @default.
• W1972685725 cites W2159056369 @default.
• W1972685725 cites W2164050728 @default.
• W1972685725 cites W2164073360 @default.
• W1972685725 cites W2166689829 @default.
• W1972685725 cites W2169606651 @default.
• W1972685725 cites W2170365874 @default.
• W1972685725 cites W2319763534 @default.
• W1972685725 cites W2324483236 @default.
• W1972685725 cites W2949409743 @default.
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• W1972685725 doi "https://doi.org/10.1021/ic502780b" @default.
• W1972685725 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25700155" @default.
• W1972685725 hasPublicationYear "2015" @default.
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