Article
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY  (2011)

Two isomorphous transition metal complexes containing a protonated diamino-purine ligand: Diaqua-bis-(2,6-diamino-7H-purin-1-ium-?N 9)bis(homophthalato-?O)nickel(II) tetra-hydrate and the cobalt(II) analogue

Atria A.M.; Herrera, N; Corsini, G; Garland M.T.; Baggio R.

Keywords: chemistry, complexes, acid, coordination, ligands, water, state, ions, elements, hydrogen, x-ray, bond, metal, structure, transition, conformation, ligand, protonation, ray, compound, nickel, bonds, organometallic, element, drug, cobalt, molecular, article, molecule, tetrahydrate, bonding, hydrates, dianions, crystallography, 1, compounds, derivative, chemical, X, 2, Acetic, 2,6, positive, Diamino, Crystallography,, three-dimensional, Title, Protonated, 7h, purin, Tetra, bondings, diaminopurine, Monodentates, Homophthalic, aminopurine, 2,6-diaminopurine, diaquabis(2,6, ium, kappaN9)bis(homophthalato, kappaO)nickel(II), diaquabis(2,6-diamino-7H-purin-1-ium-kappaN9)bis(homophthalato-kappaO)nickel(II), 2-Aminopurine

Abstract

The two isomorphous title compounds, [M(C 5H 7N 6) 2(C 9H 6O 4) 2(H 2O) 2]· 4H 2O or M 2+(Hdap +) 2(hpt 2-) 2(H 2O) 2·4H 2O {where dap is 2,6-diamino-purine, H 2hpt is homophthalic acid [2-(2-carboxy-phenyl)- acetic acid] and M is Ni II or Co II}, consist of neutral M 2+(Hdap +) 2(hpt 2-) 2(H 2O) 2 monomers, where the M II cation lies on an inversion centre and its MN 2O 4 octa-hedral environment is defined by one N atom (from Hdap +), two O atoms (from one hpt 2- dianion and one water molecule) and their inversion images. The structures are unusual in that the Hdap + cation occurs in an uncommon protonated state (as 2,6-diamino-7H-purin-1-ium) and both ligands bind in an unprecedented monodentate fashion. The existence of a large number of donors and acceptors for hydrogen bonding, together with ?-? inter-actions, leads to a rather complex three-dimensional structure. © 2011 International Union of Crystallography.

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Título de la Revista: ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY
Volumen: 67
Número: 5
Editorial: WILEY-BLACKWELL
Fecha de publicación: 2011
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-79955577379&partnerID=q2rCbXpz