A Structural Study of the Iminodiacetate Moiety Conformation in N‐(1‐adamantyl)‐iminodiacetate(2‐) Copper(II) Complexes |
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| Authors: | Regina Fernández‐Piñar Celia Sánchez de Medina‐Revilla Alicia Domínguez‐Martín María Pilar Brandi‐Blanco Duane Choquesillo‐Lazarte Josefa María González‐Pérez Juan Niclós‐Gutiérrez Prof |
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| Institution: | 1. Granada/Spain, Department of Inorganic Chemistry, University of Granada;2. Granada/Spain, Laboratorio de Estudios Cristalográficos, IACT CSIC, P. T. Ciencias de la Salud;3. Granada/Spain, Department of Inorganic Chemistry, University of GranadaDepartment of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E‐18071 Granada, Spain |
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| Abstract: | N,N‐bis(carboxymethyl)‐1‐adamantylamine acid (H2BCAA) or N‐(1‐adamantyl)‐iminodiacetic acid forms zwitterions that are intra‐stabilized by a ‘bifurcated’ N+‐H···O(carboxyl)2 interaction. In the crystal, both half‐protonated carboxyl groups of H2BCAA± are involved in linear O‐H···O inter‐molecular bridges of 2.46Å. In the studied BCAA‐CuII derivatives, the iminodiacetate‐moiety of the BCAA chelating ligand exhibits a mer‐NO2 conformation in Cu(BCAA)(H2O)2] ( 1 ) and Cu(BCAA)(Him)]2 ( 2 ), but a fac‐O2+N(apical) conformation in Cu(BCAA)(bpy)(H2O)]·3.5H2O ( 3 ) Him = imidazole, bpy =2,2′‐bipyridine]. In clear contrast, dipyridylamine (dpya), as auxiliary ligand, seems to be unable to promote the fac‐O2+N(apical) conformation in BCAA, as reveal the structures of two new salts with the trinuclear cation (dpya)2Cu‐μ2‐Cu(BCAA)2‐Cu(dpya)2]2+ and the anions Cu(BCAA)2]2? ( 4 ) or NO3? ( 5 ), respectively. |
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| Keywords: | Copper Imidazole Bipyridine Dipyridylamine Adamantamine Iminodiacetate Crystal structure |
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