title: Four-stranded coordination helices containing silver-adenine (purine) metallaquartets.
abstract: This Communication describes structures of a family of silver-adenine (purine) metallaquartets that occur in a four-stranded coordination motif, bearing a close resemblance to nucleic acid quadruplexes. Using modified purine frameworks, it is further demonstrated that subtle variations in nucleobase heterocycle are tolerable and a metallaquartet is obtained irrespective of the substitution, thus suggesting a high-propensity silver-adenine interaction to achieve quartet structures. All of the solid-state structures studied were orthorhombic, belonging to the Fdd2 space group.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India.
authors.forename: Chandra Shekhar
authors.initials: CS
authors.lastname: Purohit
authors.forename: Ashutosh Kumar
authors.initials: AK
authors.lastname: Mishra
authors.forename: Sandeep
authors.initials: S
authors.lastname: Verma
mesh_terms: D000225:Adenine / Q000737:chemistry*; D001482:Base Composition; D002621:Chemistry / Q000379:methods*; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D015394:Molecular Structure; D011687:Purines / Q000737:chemistry; D012834:Silver / Q000737:chemistry*
chemical_list: D008670:Metals; D011687:Purines; D012834:Silver; D000225:Adenine; C030985:purine