Сrystal engineering and magnetic properties of coordination polymers based on transition metal nitrate complexes with singly charged cationsстатьяТезисы
Аннотация:Nitrate complexes (NC) of transition metals are of great interest with their original crystal structure, due to the geometric features of the nitrate group, which can exhibit variable denticity in combination with various bridging functions. NC are capable of forming structures of various dimensions, which may contain both isolated anions and polynuclear coordination polymers (chains, ribbons, layers, or three-dimensional frameworks) (Fig. 1a, b). Among various systems studied in terms of low-dimensional magnetism [1], anhydrous transition metal nitrates stand out by peculiar properties stemming from the frustration of leading exchange interactions. In this paper, we present the results of a synthesis, structure investigation and physical properties of 10 new anionic layered NC with the general formula AIxBIy[TMIIz(NO3)x+y+2z] (A, B – alkali metal or pyridinium, TM – transition metal = Mn, Co, Ni, Cu). The crystal structure of the obtained compounds was established by X-ray diffraction analysis. In some cases, the nature of reversible structural phase transitions has been studied. Physical properties were investigated by measuring of T-dependence of magnetic susceptibility,magnetization and heat capacity.
