Stereoselectivity in the binding of the bis(acetylacetonato)(nitro)cobalt(III) moiety to purines and pyrimidines and their nucleosides, interligand interactions in stereoselectivity, and the molecular and crystal structure of the bis(acetylacetonato)(nitro)(deoxyadenosine)cobalt(III) complex

Chlorido-, aqua-, 9-ethylguanine- and 9-ethyladenine-adducts of cytotoxic ruthenium arene complexes containing O,O-chelating ligands

“…Such H-bond formation may contribute to the stabilisation of this adduct and could account for the significant binding of {(g 6 -p-cym)Ru(acac)} + to adenine bases in contrast to the analogous en complex. The ability of an acac ligand to induce selectivity into nucleobase recognition has been noted for the complex Na[Co(acac) 2 (NO 2 ) 2 ] by Marzilli et al [48]. In a deoxyadenosine adduct the N6HÁ Á ÁO(acac) distance was ca.…”

Intramolecular Hydrogen-Bonding, Cation−π, and π-Stacking Interactions Affectingcis/trans Isomerization: Hexacarbonyltungsten Derivatives of Pyridyl-Substituted Arylphosphane Ligands

“…There are, however, examples of intramolecular π-stacking in transition metal complexes, both interligand [2,3] and intraligand. [4Ϫ6] There have also been studies concerning interligand hydrogen bonding in biochemically interesting purine and pyrimidine complexes, [7,8] theoretical studies of interligand hydrogen bonding between nitrogen donor ligands and small ligands such as H 2 O, HF, or NH 3 , [9,10] and some studies concerning interligand CHϪπ interactions. [11,12] The full potential of attractive interactions between the ligands of organometallic complexes has not been evaluated: Attractive interactions between the ligands or between a ligand and a substrate offer a very promising approach to organometallic catalysis.…”

Tris(3-nitroso-2,4-pentanedionato)cobalt(III): strong evidence for a facial geometry analogous to ferroverdin

“…However, the C(3) signal of I is shifted downfield by almost 60 ppm on nitrosation to 155.58 ppm and is appreciably diminished in intensity as expected from the absence of any C-H bonds. The C (2) resonances in II and III are both at --189 ppm and the signal of one of the carbonyl carbons of I is also found in this region at 189.01 ppm. We tentatively assign this signal to C(2).…”