caa a22 4500 477139604 CHVBK 20180405111729.0 cr unu---uuuuu 170330e19970201xx s 000 0 eng 10.1007/BF02767919 doi (NATIONALLICENCE)springer-10.1007/BF02767919 A direct carbon-13 and nitrogen-15 nmr study of europium(iii)-isothiocyanate complex formation in aqueous solvent mixtures [Elektronische Daten] [A. Fratiello, V. Kubo-Anderson, E. Bolanos, J. Ortega, R. Perrigan, L. Saenz, S. Stoll, K. Wong] A continuation of the contact ion-pairing studies of the trivalent lanthanides by direct, low-temperature, multinuclear magnetic resonance techniques has been completed for the europium(III)-isothiocyanate system. In water-acetone-Freon-22 solvent mixtures, ligand exchange is sufficiently slow at — 100°C to - 125°C to permit the observation of13C and15N NMR signals for Eu3+-NCS- contact ion-pair complexes. With each nuclide, signals for four complexes are observed, displaced approximately 250 ppm upfield from free anion in the13C spectra, and 2,500 ppm upfield from bulk NCS- in the15N spectra. The concentration dependence of the signal areas is consistent with the formation of Eu(NCS)2+ through Eu(NCS) 4 1- , with water molecules completing the solvation shell. In the15N NMR spectra, the large chemical shifts identified the nitrogen atom as the NCS- binding site. Also, the observation of two15N NMR signals for isomers of Eu(NCS) 2 1+ was possible in several spectra. In methanol, a medium of higher dielectric constant, complex formation was diminished, with signal area integrations confirming the dominance of Eu(NCS) 1 2+ . A comparative binding study of Cl- and NCS- also was made by35C1 NMR chemical shift and linewidth measurements in water-methanol mixtures. The much stronger coordinating ability of NCS- was evident in these experiments, but there is a strong possibility of Eu3+-Cl- ion-pairing in the absence of this anion. Plenum Publishing Corporation, 1997 Carbon-13 nationallicence nitrogen-15 nationallicence chlorine-35 nationallicence europium-isothiocyanate complexes nationallicence water-acetone-Freon nationallicence water-methanol nationallicence Fratiello A. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Kubo-Anderson V. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Bolanos E. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Ortega J. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Perrigan R. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Saenz L. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Stoll S. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Wong K. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut Journal of Solution Chemistry Springer-Verlag 26/2(1997-02-01), 163-181 0095-9782 26:2<163 1997 26 10953 https://doi.org/10.1007/BF02767919 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02767919 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fratiello A. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Kubo-Anderson V. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Bolanos E. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Ortega J. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Perrigan R. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Saenz L. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Stoll S. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 700 1- Wong K. Department of Chemistry and Biochemistry, California State University Los Angeles, 90032, Los Angeles, California aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer-Verlag 26/2(1997-02-01), 163-181 0095-9782 26:2<163 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 472620576 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer