Co(II)-doped MOF-5 nano/microcrystals: Solvatochromic behaviour, sensing solvent molecules and gas sorption property

• Published in: Journal of solid state chemistry 2014-10, Vol.218, p.50-55
• Main Authors: Yang, Ji-Min, Liu, Qing, Sun, Wei-Yin
• Format: Article
• Language: English
• Subjects: Co(II)-doped MOF-5; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; CRYSTALS; Discharges for spectral sources (including inductively coupled plasmas); DOPED MATERIALS; Electric discharges; EMISSION SPECTROSCOPY; Exact sciences and technology; FIELD EMISSION; Growth from solutions; HYDROTHERMAL SYNTHESIS; INFRARED SPECTRA; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Materials science; Methods of crystal growth; physics of crystal growth; MOLECULES; Nano/microcrystals; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; Organic compounds; PARTICLES; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; POROUS MATERIALS; Porous materials; granular materials; POWDERS; SCANNING ELECTRON MICROSCOPY; Solvatochromism; SOLVENTS; SORPTION; Sorption property; Specific materials; STABILITY; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; SURFACE AREA; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2014.06.004

Co(II)-doped MOF-5 nano/microcrystals with controllable morphology and size were successfully obtained by solvothermal method. The products were characterized by powder X-ray diffraction (PXRD), energy dispersive spectrometry (EDS), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), inductively coupled plasma optical emission spectrometer (ICP-OES), elemental analysis, UV–vis and infrared (IR) spectroscopy. The factors influencing the crystal morphology and size were investigated. The gas sorption measurements reveal that highly crystalline particles have large Langmuir surface area. It was found that the Co(II)-doped MOF-5 shows enhanced hydrostability and the sorption profiles of the Co(II)-doped MOF-5 nano/microcrystals are dependent on the morphology and size of the particles. Porous Co(II)-doped MOF-5 is stable upon the removal of guest molecules and exhibits different colour with accommodating different solvent molecule, which means that it can act as solvatochromic sensing materials for recognition of solvent molecules. Co(II)-doped MOF-5 nano/microcrystals with different shapes and sizes were synthesized by a facile hydrothermal method, which not only enhance gas sorption properties and structural stability of MOFs towards moisture, but also act as new sensing materials for sensing small molecules. [Display omitted] •Co(II)-doped MOF-5 nano/microcrystals with controllable morphology and size were obtained.•Co(II)-doped MOF-5 nano/microcrystals enhance the structural stability towards moisture.•Co(II)-doped MOF-5 can act as new sensing material for sensing small molecules.