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Characterization of the complexes prepared using building block tris(oxsalato) chromate containing different alkyl ammonium cations

In the field of molecular magnetism, the oxalate group, C2O4 2-, has been demonstrated to be one of the most versatile ligands used in the preparation of the magnetic materials. Due to its various coordination modes towards the metal centres as well as its ability to mediate magnetic interactions between paramagnetic metal ions, a large number of oxalate-based transitionmetal species of different nuclearity, connectivity and dimensionality have been synthesized and characterized, many of them having tunable magnetic frameworks[1] Furthermore, oxalate-bridged crystalline coordination polymers have been studied as hydrated proton-conductive systems owing to their high crystallinity and high stability for water. Generally, the existence of hydrated protons is required to achieve high proton conductivity of solids at ambient temperature. The studies of proton conduction in coordination polymers mainly include two kinds of situations: one is that under the anhydrous condition, it mainly relies on the inherent water molecules or other minor molecules containing protons and hydrogenbond network in the structures to carry out the proton transfer ; another one is that under the aqueous condition, the external H2O units play a vital function on the proton transmission.[2] To achieve our final goal – exploration of the complexes containing noteworthy structural, magnetic and electrical features, two novel homo- and heterometallic oxalate-based systems have been synthesized and characterized using tris(oxalato)chromate, A3[CrIII(C2O4)3] [A = (C2H5)2(CH3)NH+ or (C2H5)(CH3)2NH+ ], as ligands towards second transition metal ion (MnII or CuII): {; ; [NH(CH3)(C2H5)2][Cr(bpy)(μ- C2O4)2MnCl2]}; ; n (1 ; bpy = 2, 2'-bipyridine) and [NH(CH3)2(C2H5)][Cr(H2O)(C2O4)2] (2).

coordination compounds ; oxalate group ; crystal structure, proton conductivity

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