Dialkyl-substituted monoamidinium-templated oxalate-based noncentrosymmetric 2D compounds

Publication date: Available online 6 May 2019Source: Comptes Rendus ChimieAuthor(s): Catalin Maxim, Sylvie Ferlay, Cyrille TrainAbstract1-Propyl-2-phenyl-3-methylamidinium (A) and 1-hexyl-2-phenyl-3-methylamidinium (B) cations are used to template the formation of two-dimensional (2D) oxalate-based bimetallic compounds of formula A[MnIICrIII(C2O4)3] (1) and B[MnIICrIII(C2O4)3] (2). The single-crystal X-rays diffraction analysis revealed that both compounds crystallize in noncentrosymmetric space groups. In both compounds, the bimetallic coordination network is made of slightly corrugated 2D (6,3) bimetallic honeycomb layers arranged in an eclipsed manner. The monocations are located between the layers without any preferential interaction with the anionic coordination network. The magnetic susceptibility measurements can be fitted using a Curie–Weiss law with Curie–Weiss temperatures of 9.9 K for 1 and 9.0 K for 2, revealing that the dominating exchange interaction is ferromagnetic. This favors the onset of a ferromagnetic long-range ordering at 6.0 K for 1 and 5.8 K for 2.Graphical abstract

Source: Comptes Rendus Chimie - May 7, 2019 Category: Chemistry Source Type: research