TítuloDitopic receptors containing urea groups for solvent extraction of Cu(II) salts
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Figure
![Fig. 2. The X-ray structure of [CuL 3 (SO 4 )]. Hydrogen atoms bonded to carbon atoms are omitted for clarity](https://thumb-us.123doks.com/thumbv2/123dok_es/7402592.381344/5.892.223.672.331.668/structure-hydrogen-atoms-bonded-carbon-atoms-omitted-clarity.webp)
![Table 2. Some intramolecular hydrogen bonds in [CuL 3 (SO 4 )]·MeOH, [ZnL 3 (NO 3 )](NO 3 )·0.75MeOH and [CuL 1 (μ-SO 4 )] 2 ·C 6 H 6 N 2 O 2](https://thumb-us.123doks.com/thumbv2/123dok_es/7402592.381344/6.892.126.772.570.885/table-intramolecular-hydrogen-bonds-cul-meoh-znl-meoh.webp)
![Fig. 4. View of the X-ray structure of [CuL 1 (μ-SO 4 )] 2 . Hydrogen atoms bonded to carbon atoms are omitted for clarity](https://thumb-us.123doks.com/thumbv2/123dok_es/7402592.381344/7.892.318.573.638.1123/view-structure-hydrogen-atoms-bonded-carbon-omitted-clarity.webp)
![Fig. 6. UV/vis spectra recorded during the titration of [CuL 3 (OSMe 2 )] 2+ (10 −3 M in dmso) with a standard solution (0.1 M in dmso, 25 °C) of: (a) [Bu 4 N]·HSO 4 ; (b) [Bu 4 N]·Cl; (c) [Bu 4 N]·NO 2 and (d) [Bu 4 N]·MeCO 2](https://thumb-us.123doks.com/thumbv2/123dok_es/7402592.381344/10.1262.203.1064.84.722/fig-spectra-recorded-titration-osme-standard-solution-meco.webp)
![Table 4. Crystal data and refinement details for L 3 , [CuL 3 (SO 4 )]·MeOH, [ZnL 3 (NO 3 )](NO 3 )·0.75MeOH and [CuL 1 (μ-SO 4 )] 2 ·C 6 H 6 N 2 O 2](https://thumb-us.123doks.com/thumbv2/123dok_es/7402592.381344/21.892.87.814.527.1088/table-crystal-refinement-details-meoh-znl-meoh-cul.webp)
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