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• W2030408946 abstract "The design and synthesis of receptors containing a Cu(II) binding site with appended ammonium groups (1) and guanidinium groups (2), along with thermodynamics analyses of anion binding, are reported. Both receptors 1 and 2 show high affinities (10(4) M(-1)) and selectivities for phosphate over other anions in 98:2 water:methanol at biological pH. The binding of the host-guest pairs is proposed to proceed through ion-pairing interactions between the charged functional groups on both the host and the guest. The affinities and selectivities for oxyanions were determined using UV/vis titration techniques. Additionally, thermodynamic investigations indicate that the 1:phosphate complex is primarily entropy driven, while the 2:phosphate complex displays both favorable enthalpy and entropy changes. The thermodynamic data for binding provide a picture of the roles of the host, guest, counterions, and solvent. The difference in the entropy and enthalpy driving forces for the ammonium and guanidinium containing hosts are postulated to derive primarily from differences in the solvation shell of these two groups." @default.
• W2030408946 created "2016-06-24" @default.
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• W2030408946 date "2003-11-05" @default.
• W2030408946 modified "2023-09-26" @default.
• W2030408946 title "Energetics of Phosphate Binding to Ammonium and Guanidinium Containing Metallo-Receptors in Water" @default.
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• W2030408946 doi "https://doi.org/10.1021/ja030507k" @default.
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