Biologically important ternary coordination complex. Crystal and molecular structures of adenine-glycylglycine-copper(II) complex

The preparation and magnetic and structural examination of monomeric, dimeric, and polymeric adenine complexes of copper(II)

“…[23][24][25][26] Unidentate coordination of neutral adenine (via N9) has also been demonstrated in the complex [Cu(glygly) (Ad) H20], where glygly = glycylglycinato. 27 In complexes of 9methyladenine, where the favored site of coordination is blocked, the ligand coordinates to copper in unidentate fashion via N7.16 '28 Two complexes involving protonated adenine coordinated to copper(II) have been characterized. The unique trimeric complex (AdH+)2Cu3Cl84H20 involves both adeninium and chloride bridges between the central and terminal copper(II) sites,29 and we have recently characterized the magnetic exchange in this complex.5 [Cu(AdH+)2Br2]Br2 involves unidentate coordination of protonated adenine.…”

A redetermination of (N9-adenine-κN)aqua[glycylglycinato(2−)-κ3N,N′,O]copper(II)

“…(2007). E63, m1598 [https://doi.org/10.1107/S1600536807021605] A redetermination of (N 9 -adenine-κN)aqua[glycylglycinato (2− The molecular structure of the title compound, (I) ( Fig.1), has been reported previously (Tomita et al, 1973) but the prescision of the current structure determination is vastly improved. The Cu II ion exhibits a square base pyramidal 4 + 1 coordination, τ parameter 0.26 (Addison et al, 1984).…”

“…The reported molecular recognition mode was not described previously (Tomita et al, 1973). In constrast, it has long been known that in the closely related [Cu(glygly)(9Meade)-(H 2 O)]Á4H 2 O (9Meade is 9-methyladenine; Kistenmacher et al, 1976), the Cu-N(9Meade) bond is reinforced by one N amine -HÁ Á ÁO(apical/aqua) intramolecular bond, but there is not a direct glygly-9-methyladenine intramolecular interligand interaction.…”

Synthesis and structural characterization of 9-ethylguaninium tetrachloroplatinate(II) dihydrate. A crystallographic and proton nuclear magnetic resonance study

“…Subsequent successful refinement of the structure revealed that the space group was P\. Using the least-squares method of Busing and Levy,25 the lattice constants were refined to be a = 7.916 (8), b = 16.30 (2), c = 9.13 (1) A, a = 138.25 (5), ß = 118.3 (1), y = 86. 6 (1)°.…”