Structural characterization of a lariat ether based on 4,10-diaza-2,3,11,12-dibenzo-18-crown-6 and of a coordination Pb(II) complex using picrate as co-ligand |
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| Authors: | Julio-César Aguilar Sylvain Bernès Paola Gómez-Tagle Richard A Bartsch Josefina de Gyves |
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| Institution: | (1) Departamento de Química Analítica, DEPg, Facultad de Química, UNAM, Ciudad Universitaria, 04510 México, Mexico;(2) Centro de Química, Instituto de Ciencias, Universidad Autónoma de Puebla, A.P. 1613, 72000 Puebla, Mexico;(3) Departamento de Química Inorgánica y Nuclear, DEPg, Facultad de Química, UNAM, Ciudad Universitaria, 04510 México, Mexico;(4) Department of Chemistry and Biochemistry, Texas Tech University, 79409-1061 Lubbock, Texas, USA |
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| Abstract: | A new lariat ether, N,N′-di(methylenecarboxyethoxy)-4,10-diaza-2,3,11,12-dibenzo-18-crown-6, C28H38N2O8, has been characterized and tested for Pb2+ extraction in a picrate medium. The isolated complex, (picrato-O,O′)-(N,N′-di-methylenecarboxyethoxy-4,10-diaza-2,3,11,12-dibenzo-18-crown-6)]-lead(II) picrate, C34H40N5O15Pb]+C6H2N3O7]−, includes a 7-coordinated Pb2+ cation complex where sidearms of the macrocycle are involved in complexation, with Pb‐O bond lengths of 2.587(4) and 2.617(4) ?. Picrate ions serve both as co-ligand and as anion for charge balance. Both free ligand and Pb2+ complex have been X-ray characterized: a = 18.4723(16), b = 24.0057(19), c = 14.4309(14) ?, β = 112.962(7)°, P21/c, for the ligand; a = 12.7591(15), b = 21.951(2), c = 16.4389(15) ?, β = 97.144(8)°, P21/n, for the complex. |
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| Keywords: | extraction heavy metal X-ray structure macrocycle conformational analysis |
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