Synthesis and studies of trisubstituted biphthalonitrile/Fe$_{3}$O$_{4}$ magnetic hybrid microspheres

New trisubstituted biphthalonitrile/magnetite (TSB/Fe$_{3}$O$_{4}$) magnetic hybrid microspheres were synthesized from TSB and FeCl$_{3}$ $\cdot$ 6H$_{2}$O using the method of one-stage thermal temperature crystallization of solvents. The morphology and structure of magnetic hybrid microspheres were inspected using a scanning electron microscope, IR Fourier spectroscopy, and X-ray diffraction. It was found that the grown TSB/Fe$_{3}$O$_{4}$ magnetic hybrid microspheres represent spherical particles with an average size of $\sim$137 nm and a small size spread. The size and size distribution of magnetic hybrid microspheres can be controlled by a small change in the ratio of TSB and Fe$^{3+}$ ion contents in the microsphere. TSB/Fe$_{3}$O$_{4}$ hybrid microspheres exhibit a rather high saturation magnetization (58.16 emu g$^{-1}$) and new microwave electromagnetic properties, i.e., lower (in comparison with published) dielectric losses at low frequencies; magnetic losses are increased obviously due to an increase in the TSB content. Furthermore, it is detected that magnetic hybrid microspheres absorb microwaves, and strong reflection losses in a wide frequency range are established. The effective reflection loss of -31 dB is obtained in the microwave range from 2 to 16 GHz due to TSB content variations. Wide absorption properties of microwaves along with regular spherical shape and excellent magnetic properties offer wide opportunities for various applications of TSB/Fe$_{3}$O$_{4}$ magnetic hybrid microspheres as functional materials.