132872-98-1Relevant academic research and scientific papers
Synthesis and structural characterization of diene- and carbonyl-rhodium(I) complexes containing bridging adeninate ligands
Sheldrick, William S.,Guenther, Barbara
, p. 265 - 280 (2007/10/02)
Diene- and dicarbonyl-rhodium(I) complexes -1)>2 (diene = cod, nbd) and -1)>2 have been prepared by the reaction of or with the adenine derivatives: adenine (AdH), N6-methyladenine (6MadH) and N6,N6-dimethyladenine (DmadH).These dimeric complexes exhibit N3, N9 coordination of the bridging adeninate ligands as demonstrated by an X-ray structural study of 2 3c, prepared by substitution of a carbonyl ligand in 2 3b by PPh3.In contrast, a tetrameric structure was observed for -1)>4 4 (3mad = 3-methyladenine), in which the 3madH-1 anions are coordinated at N6 and N7.When N7 coordination is unfavourable and N9 unavailable, which is the case for 8-aza-9-methyladenine (Maad), N1, N6 binding may be observed, as established by an X-ray structural study of -1)>2 5.However, in order to achieve this coordination mode it is necesssary for the substituted exocyclic amino groups (N6) to twist by an average angle of 31.2 deg out of the base plane.
Synthesis and structure of the mixed bridged diene-rhodium(I) complex . Reactions with the modified purine bases N6,N6-dimethyladenine and 8-aza-9-methyladenine
Sheldrick, W. S.,Guenther, B.
, p. 233 - 244 (2007/10/02)
The mixed bridged diene-rhodium(I) complex (1) has been prepared by the reaction of equivalent quantities of 2 and potassium or sodium acetate at reflux in methanol. 1 exhibits an Rh...Rh distance of 3.161(1) Angstroem.Reaction of 1 with N6,N6-dimethyladenine (DmadH) yields (2), and 2 (3), which show N3 and N3,N9 metal binding, respectively.In contrast, reaction of 1 with 8-aza-9-methyladenine (Maad) gives only one product, dimer -1)Rh(cod)Cl>2 (4) in which the nucleobase is tridentate with N1, N6 and N7 as rhodium binding sites.The structures of 1, 2, and 4 have been established by X-ray structural analysis.The rhodium atom in 4 which is bonded to N1 is displaced by 1.08 Angstroem from the plane of the pertinent nucleobase.
