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- W2152472491 abstract "The anion coordination chemistry of two protonated urea-based ligands, N-(2,4-dimethylphenyl)-N′-(3-pyridy1)urea (1) and N-(2,6-dimethylphenyl)-N′-(3-pyridy1)urea (2) is reported. Reaction of 1 or 2 with inorganic oxo-acids such as perchloric, nitric or sulfuric acid affords the adducts (3–6) of the corresponding anions with protonated ligands (1H+ and 2H+). The solid-state structures of the anion complexes display a rich variety of hydrogen bond motifs involving the urea NH groups, carbonyl, protonated pyridyl NH+ fragment, water molecules, and the anions. While complexes with ligand 1 (3 and 4) crystallize as monohydrate, compounds with 2 (5 and 6) are solvent-free, which leads to notable differences in their hydrogen bond patterns. When crystallized from the acid mixture HClO4/HNO3 or HClO4/H2SO4 both 1 and 2 selectively bind the perchlorate anion." @default.
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- W2152472491 date "2007-01-01" @default.
- W2152472491 modified "2023-10-09" @default.
- W2152472491 title "Oxo-anion binding by protonated (dimethylphenyl)(pyridyl)ureas" @default.
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- W2152472491 doi "https://doi.org/10.1039/b702278f" @default.
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