Interligand interactions involved in the molecular recognition between copper(II) complexes and adenine or related purines |
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Authors: | Duane Choquesillo-Lazarte María del Pilar Brandi-Blanco Isabel García-Santos Josefa María Gonzlez-Prez Alfonso Castieiras Juan Nicls-Gutirrez |
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Institution: | aLaboratorio de Estudios Cristalográficos, IACT–CSIC, P. T. Ciencias de la Salud, Granada, Spain;bDepartment of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain;cDepartment of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain |
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Abstract: | The available crystal structure information in the CSD database on ternary species prepared by the reaction of diverse copper(II) complexes (CuL) and purine, adenine and guanine or related purine derivatives is considered in order to deepen the intra-molecular interligand interactions affecting the molecular recognition patterns of the ‘metal complex + purine nucleobase’ and closely related systems. The degree of protonation and the possibilities of different tautomeric forms in the purine-like moieties are taken into account. The main conclusion is a general trend to form a Cu N(purine-like) coordination bond which can be reinforced by an intra-molecular interligand H-bonding interaction. N H(purines) A (O or Cl acceptor) or N H(amino ligand L) O6(oxo-purines) are commonly observed. In addition, selected examples revealed that the presence of a variety of non-coordinating groups in L or in the purine-like nucleobases can significantly influence the structurally observed molecular recognition pattern. Moreover, examples are known where binuclear cores of the types CuII2(μ2-N3,N9-adeninate)4(aqua)2 or CuI2(μ2-N3,N9-adeninate)2(aqua)2 recognise CuL chelates by means of the expectable pattern (Cu N7 coordination bond + N6 H O(L) interaction). |
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Keywords: | Interligand interactions Molecular recognition Crystal structures Copper Mixed-ligand complexes Purine Adenine Guanine Nucleobase |
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