Supramolecular Architectures Based on Metal–Cytosine Systems

Abstract

Five new compounds of cytosine with first-row transition metals, (H 2 Cyt) 2 [CoCl 4 ]·2(HCyt) (1), [CoBr 2 (HCyt) 2 ] (2), [ZnCl 2 (HCyt) 2 ] (3), [CuCl 2 (HCyt) 2 ] (4), and [CuBr 2 (HCyt) 2 ] (5) (in which HCyt = cytosine, H 2 Cyt = cytosinium cation), are reported. In 1, the protonation of one of the cytosine molecules facilitates base pairing with the neutral cytosine, instead of the expected coordination to the metal center. In all other compounds, neutral cytosine molecules are coordinated to the M II centers through N3 positions, forming monomeric entities. The supramolecular crystal structure of 1 is sustained by the basepairing interactions between the 1H,3H-cytosinium cation and [a]

Enhancement of Intermolecular Magnetic Exchange through Halogen···Halogen Interactions in Bisadeninium Rhenium(IV) Salts

“…Adenine is one of the five main natural nucleobases that are precursors and part of the self-assembled structures of nucleic acids (DNA and RNA). As with other nucleobases, adenine has been studied for decades due to its capacity to establish diverse noncovalent interactions and its potential metal ion binding ability in complex, natural, and artificial nanostructures. − It is well-known that the combination of hydrogen bonds and π–π stacking interactions among nucleobases provides the conformation and function of macromolecular biological systems. − Protonated and deprotonated nucleobases play a key role in many biochemical processes and can also generate supramolecular compounds of interest in crystal engineering, molecular recognition, liquid crystals, molecule-based magnetism, and materials science. − …”

Hybrid Hydrogen‐Bonded Organic Frameworks: Structures and Functional Applications

“…Fewer N or O atoms in pyrimidines means fewer coordinated sites and hydrogen‐bonded sites. Thus there reports limited pyrimidines‐based HOFs [92] . As seen in Figure 9d, approximately vertical hydrogen bond donors and acceptors on guanine make it possible to self‐assemble into the square‐planar G‐quartets [93] .…”

“…Thus there reports limited pyrimidines-based HOFs. [92] As seen in Figure 9d, approximately vertical hydrogen bond donors and acceptors on guanine make it possible to selfassemble into the square-planar G-quartets. [93] The four central oxygens can combine with alkali metal or earth metal through ion-dipole interactions to stabilize the structure.…”