Presence and absence of intrinsic magnetism in graphitic carbon nitrides designed through C–N–H building blocks

Abstract

We use the first principle calculation to investigate the intrinsic magnetism of graphitic carbon nitrides (GCNs). By preserving three-fold symmetry, the GCN building blocks have been built out of different combinations between 6 components which are C atom, N atom, s-triazine, heptazine, heptazine with C atom at the center, and benzimidazole-like component. That results in 20 phases where 11 phases have been previously reported, and 9 phases are newly derived. The partial density of states and charge density have been analyzed through 20 phases to understand the origin of the presence and absence of intrinsic magnetism in GCNs. The intrinsic magnetism will be present not only because the GCNs comprising of radical components but also the $$\pi$$ π -conjugated states are not the valence maximum to break the delocalization of unpaired electrons. The building blocks are also employed to study alloys between g-$$\hbox {C}_3\hbox {N}_4$$ C 3 N 4 and g-$$\hbox {C}_4\hbox {N}_3$$ C 4 N 3 . The magnetization of the alloys has been found to be linearly dependent on a number of C atoms in the unit cell and some magnetic alloys are energetically favorable. Moreover, the intrinsic magnetism in GCNs can be promoted or demoted by passivating with a H atom depending on the passivated positions.

An Insight into All Tested Small Molecules against Fusarium oxysporum f. sp. Albedinis: A Comparative Review

“…Due to their biological activity and chemical properties in recent years, fused heterocyclic compounds containing bridgehead nitrogen or oxygen donor atoms have drawn further interest. Indeed, several classes are reported in this review as pyrazole-and imidazole-based derivatives [16] presented in different biomolecules, such as histidine [17], histamine [18], and natural products [19]; this is an exciting building block [20]. Specifically, in recent decades, 4,5-diarylpyrazoles [21] and 2,5-diarylimidazoles [22] have gained interesting recognition as possible biomolecules in the field of drug development.…”