Small Carboxylate-based Complexes

Molecule materials have drawn considerable attentions owning to a great variety ofstructures and their outstanding properties in recent years. As a part of molecule materials,molecule based magnetic materials also gain extensively attention. However, it is alwayschallenging to obtain desired coordination complexes which possess high phase-transitiontemperature and magnetization. The Kagomé layers are extremely interesting because of theirspecial magnetic functions such as spin canting, spin frustration and so on among a variety of2D layer constructions. The1,2,3-triazole-4,5-dicarboxylate which is a polydentate ligandcould coordinate to metal ions to form triangular arrangement, so that it is a good candidate toconstruct geometrically frustrated magnetic Kagomé layers.The choice of small formic acidmake the construction of desired magnetic compounds possible due to its wealthycoordination modes and excellent delivery of magnetic interactions.Meanwhile, the thermaldecomposition of metal formate makes the preparation of various metal oxides easier.In this work, two novel manganese complexes successfully synthesized with the differentcarboxylate by pillared-layer strategy using hydrothermal method. The metal ions coordinatedto1,2,3-triazole-4,5-dicarboxylate ligand to obtain Kagomé layers, which were furtherpillared by NIO and IMA to form similar pillar-layer but distinct topology structure. Magneticstudy indicated that there are antifromagnetic interaction and spin competition, respectively.And a new complex is assembled by diamagnetic Cd ions and TzDC3-.The formate anions bridged different metal ions to form three mixed-valence complexes,(CH3NH2CH3)FeIIIFeII(HCOO)6、(CH3NH2CH3)AlIIINiII(HCOO)6and (CH3NH2CH3)AlIIICoII(HCOO)6. XRD revealed that they are α-Fe2O3、Crystalline NiO and amorphous aluminalayered composites、spinel oxides, respectively, after calcination under500°C. The studyreveals AlⅢⅢⅡ1.5Co0.5CoO4will be a good candidate for photocatalytic materials due to itsproperty of visible light absorption.