Synthesis, Structures And Properties Of Novel 2,3-dibromosuccinic Acid Complexes

Coordination Polymers are widely recognized as a unique class of novel functional meta-organic materials. They have attracted considerable attention from both the academic and industrial sectors due to their chemical and structural attributes i.e. flexible tailoring, assortment of topologies and potential applications in catalysis, gas storage and separation, magnetism, luminescence, optoelectronics, sensors, etc.. Since the early 1990 s, remarkable progress has been made in this area. However, the rational design and controlled synthesis of functional coordination polymers possessing unique structures with intended topologic often remains a significant challenge.This thesis reviewed the signification of coordination polymers,synthesis strategies and the C4 skeleton of organic acids in the first section. Then 10 complexes based on meso-2,3-dibromosuccinic acid(H2DBr S), whose important crystal data are summarized in Table 1.Table 1 Summary of important crystal dataComplexes 1-5 were synthesized from the research system of Co(II)-Phenanthrolinedibromosuccinic acid. 6-8 were assembled by meso-2,3-dibromosuccinic acid(H2DBr S) andCu(II) ions。9、10 were assembled by Co(II)/Cu(II)、dibromosuccinic acid and biby. Their X-ray single crystal diffraction, X-ray powder diffraction, IR spctra, thermostability analysis were demonstrated in this paper. Temperature-dependent magnetic susceptibility measurement of 7 and 9 were performed. The magnetic behaviors of 7 and 9 in the temperature range 2–300 K obey Curie–Weiss law c = C/(T-q), C = 0.73 and 2.16 cm3×K×mol-1, q = –13.13 and-0.40 K, and the decrease of cMT with the lowering temperature and the negative value of θ may be due to possible antiferromagnetic interactions between the metal Cu(II)/ Co(II) ions. The magnetic behaviors of 9 can be interpreted, and the best fit results in J =-0.89 cm-1, suggesting antiferromagnetic interactions. In this work, the Complex 8 is analyzed by topos 4.0 program.