Thermo nicolet nexus spectrometer

Fourier transform infrared (FTIR) spectra of the surface functional groups of the nanostructures were recorded with a Thermo Nicolet Nexus spectrometer (Thermo Fisher Scientific, Madrid, Spain) using the attenuated total reflectance (ATR) method from 4000 to 400 cm⁻¹.

If not otherwise stated, the different chemicals for the synthesis of CBV4-57 were obtained from Sigma Aldrich (Sigma Aldrich S.a.r.l; Saint-Quentin-Fallavier, France). Furthermore, unless otherwise noted, all experiments were carried out under a nitrogen atmosphere. Solvents (CH₂Cl₂ and THF) were dried via a purification solvent system MB-SP- 800 (MBRAUN, Garching, Germany). Melting points (mp) were obtained on a on a Mettler-Toledo MP50 apparatus (Mettler-Toledo, Columbus, OH, USA)and are uncorrected. IR spectra were recorded on a Thermo Nicolet Nexus spectrometer (Thermofisher Scientific, Waltham, MA, USA). NMR spectra were recorded on Bruker Avance 300 MHz spectrometers (Bruker, Wissembourg, France). The NMR spectra were acquired in CDCl₃, and the chemical shifts were reported in parts per million referring to CHCl₃ (δ_H 7.26 for proton and δ_C 77.16 for carbon). Signals are described as follows: s, singlet; brs, broad signal; d, doublet; t, triplet; m, multiplet. HRMS data were recorded on a Xevo G2 QTOF instrument (Waters, Milford, MA, USA). Reactions were monitored by TLC on silica gel Alugram® Xtra SIL G/UV₂₅₄ (Macherey-Nagel, Duren, Germany). Column chromatography was performed on Machery-Nagel silica gel 0.063-0.2 mm.

Hysteresis loops were recorded with a vibrating sample magnetometer (VSM, DMS, Lowell, MA, USA) at room temperature and under external magnetic fields from −10,000 to 10,000 Oe.
Room temperature X-ray diffraction (XRD) patterns of powder samples were obtained with a Philips PW1710 diffractometer (Panalytical, Callo End, UK) with a Cu Kα radiation (λ = 1.54186 Å) between 10° and 80° with steps of 0.02° and 10 s/step.
The composition was analyzed with a TGA Perkin Elmer model 7 (Perkin, Waltham, MA, USA).
Fourier transform infrared (FTIR) spectra were performed in a Thermo Nicolet Nexus spectrometer (Thermo Fisher Scientific, Madrid, Spain) using the attenuated total reflectance (ATR) method from 4000 to 400 cm⁻¹.
Scanning electron microscopy (SEM) with a Zeiss FE-SEM ULTRA Plus (5 kV) microscope (Zeiss, Oberkochen, Germany) and transmission electron microscopy (TEM) with a JEOL JEM-1011 microscope (100 kV) were employed to study the morphology.