X-Ray crystal structures of zinc–adenine and zinc–guanine complexes

Solution, solid state and biological characterization of ruthenium(III)-DMSO complexes with purine base derivatives

“…In unsubstituted purines N(9) is the most probable place for metal coordination [1] and the product 2 confirmed this rule. Crystal structures of guaninium metal complexes coordinated through N(9) atom are relatively rare, but copper(II) and zinc(II) compounds have already been reported [1,31,32]. In contrast, in products 1, 3, and 4, in which N(9) is blocked, ruthenium is always coordinated to N(7).…”

Adenine hydrochloride hemihydrate: three-dimensional data and refinement

“…There are a few differences, however, that should be noted: N(1)-C(6) SK 1.360, C 1.38 /~; N (7) Table 3. A detailed comparison of our bond lengths to those reported by Srinivasan & Taylor (1970) for a Zn z+ complex coordinated through N(7) shows only one difference greater than 0.01 A; C(5)-C(6) 1.403 SK, 1.42/~ in the complex. The bond lengths, at least, seem to be little affected by the coordination at N(7).…”

“…We and others have been interested in the coordination properties of protonated adenine, CsNsH6 + [de Meester, Goodgame, Price & Skapski (1970), Cu 2÷ coordinated through N(9) and N(3); Srinivasan & Taylor (1970), Zn 2÷ coordinated through N(7); de Meester, Goodgame, Price & Skapski (1971), Cu 2+ coordinated through N(9); Shigematsu & Kistenmacher (1973)]. In most of the complexes studied, N(1) has been definitely shown to be protonated as has been established to be the case in adenine hydrochloride hemihydrate.…”

[Au2(μ-G)(μ-dmpe)]·(KBr)0.75·2H2O, a cyclic dinuclear gold(I) complex with an N3,N9-bridging coordination mode of guanine and aurophilic interactions: synthesis, X-ray crystal structure and luminescence properties (dmpe=1,2-bis(dimethylphosphino)ethane and G=guaninato dianion)

“…coordinated to metal ions have been reported so far [3][4][5][6]. In two instances, MCl 3 (H 3 G) Á 2H 2 O (M ¼ Zn(II) [11] and Cu(II) [12]) guanine is protonated, as the guaninium cation, and coordinated in monodentate fashion through the N9 atom to the metal ions. In the two remaining structures, Na 10 [Pt(l-PO 4 )(G)] Á 22H 2 O [13] and [Ir(g 5 -C 5 Me 5 )(G)(H 2 O) 4 ] 4 (CF 3 SO 3 ) 4 [14] the dianion of guanine (G) is coordinated to the metal ions in N9-monodentate and N7,N9-bridging forms, respectively.…”