چكيده فارسي :
Compared to the use of organic solvents, catalytic reactions in aqueous systems have many advantages including low cost, low toxicity and safety.Water, a readily available and non-toxic solvent, has attracted much attention due to its features as improving reactivity and selectivity, simplifying workup procedure and so on. The well-defined hydrophilic catalysts might be an effective tool to promote organic transformations in aqueous media. It is noted that hydrophilic organic ligands could increase the hydrophilicity of the resulting catalysts. More importantly, hydrophilic catalysts can be easily separated from the organic products by supporting the catalyst on solid materials [1].
Consequently there has been a growing demand for the design of heterogeneous hydrophilic catalysts that could promote organic reactions in water. Different solid materials have been used as solid supports for the preparation of heterogeneous catalysts. Within these materials, nanoparticles have attracted a great deal of attention as solid materials for supporting different catalysts. However, nanometer-sized particles are easily dispersible in solution by forming stable suspensions. Therefore, their separation needs a tedious recovery procedure via expensive ultracentrifugation, which caused the inevitable loss of solid catalysts.To further address the issues of recyclability and reusability, magnetic nanoparticles have emerged as excellent supports amenable to simple magnetic separation. The magnetic nature of MNPs allows a convenient method for removing and recycling MNPssupported catalysts by applying an appropriate magnetic field, this kind of separationis not time-consuming and prevents the loss of solid catalyst in the process. It also enhances products purity and optimizes operational costs. In addition, the MNPs supported catalysts show high dispersion and reactivity with a high degree of chemical stability [2].
In continue of our recent work on the development of new heterogeneous catalysts, herein,a new hydrophilic copper complex supported on magnetic iron oxide is synthesized and characterized by different methods.
