ABSTRACT
A novel lanthanide 2-hydroxynicotinic acid coordination polymer 1 {[LaL(HL) (H2O)3]1/3 (SO4)2/3 (H3O)2 H2O} (H2 L = 2-hydroxynicotinic acid) has been synthesized under hydrothermal condition and characterized by crystal X-ray diffraction, IR, UV, TGA, two-dimensional infrared (2D IR) correlation spectroscopy with magnetic and thermal perturbation. In 1, La ions are connected by 2-hydroxynicotinic acid through both carboxylate oxygen atoms and oxygen atoms from hydroxyl group in pyridine to generate a 2D layer in the ab plane, these layers are further connected by weak interactions to form a 3D framework along c axis. The response of out-of-plane bending vibrations of N-H and C-H are remarkable in the 2D IR correlation spectra under magnetic perturbation, this may attributes to the inducement of pi-electron cloud deformation under magnetic perturbation, v4 vibrations from SO4(2-) was also sensitive to magnetic perturbation. In addition, stretching vibrations from N-H are sensitive to thermal perturbation.
ABSTRACT
A novel polyoxovanadium borate Mn2[V12B16O52 (OH)6](en)2 (H3O)6 (H2O)5 1(en = ethylenediamine) was hydrothermally synthesized and characterized by IR, two-dimensional infrared (2D IR) correlation spectroscopy with magnetic and thermal perturbation, and single crystal X-ray diffraction. In 1, it is interesting that each [V12B16O52 (OH)6]14- units is connected by four [Mn(H2O)2]2+ to generate a 2D layer on the ab plane. Along c axis, these layers are further linked by H-bond to form a 3D framework. The response of the stretching vibrations of B-O, V-O-V and Mn-O-B was detected in the 2D IR correlation spectra with magnetic perturbation. In addition, the response of the stretching vibrations of B-OH, B-O, V-O-V and Mn-O-B was detected in the 2D IR correlation spectra with thermal perturbation.
