Pyridine Carboxylate Complexes of Mo^II as Active Catalysts in Homogeneous and Heterogeneous Polymerization

Abstract

New lamellar materials intercalated with molybdenum(II) complexes with potential catalytic properties were prepared by a stepwise procedure. The lamellar material was first calcined at 823 K for four hours to eliminate all the carbonate ions; the layered structure was reconstructed after treatment with a solution of either pycH (pyridine-2-carboxylic acid) or pydcH 2 (pyridine-2,6-dicarboxylic acid) in a KOH solution of dmf at 343 K. Impregnation with a solution of the organometallic precursor [Mo(CO) 3 I 2 (NCCH 3 ) 2 ] led to substitution of the nitrile groups by two pyridine ligands. All the materials were characterized by powder X-ray diffraction, FTIR, and 13 C CP MAS and 27 Al MAS solid-state NMR spectroscopy.

Cadmium and tin complexes of Schiff-base ligands

“…Different complexes have been investigated for the treatment of diseases, such as trypanosomiasis [85] and jaundice [86]. Pyridine ligands, which have been used in the coordination chemistry of a variety of metals [87][88][89][90][91], occupy a unique position in the synthesis of biologically active compounds [92]. The chemistry of organostannyl carboxylates is one of the most fascinating fields, and pyridine tin carboxylates are the focus of many studies due to their different coordination geometries and their structural diversity, which depends upon the reaction conditions.…”

Penta- and heptacoordinated tin(IV) compounds derived from pyridine Schiff bases and 2-pyridine carboxylate: Synthesis and structural characterization

“…Pyridine ligands, which have been used in the coordination chemistry of a variety of metals [26][27][28][29][30], occupy a unique position in the synthesis of biologically active compounds [31]. The chemistry of organostannyl carboxylates is one of the more fascinating fields, and pyridine tin carboxylates are the focus of many studies due to their different coordination geometries and their structural diversity, which depends upon the reaction conditions.…”

Chiral NHC‐Complexes with Dioxolane Backbone Heterogenized on MCM‐41. Catalytic Activity

“…This was not interpreted as a loss of crystallinity, but rather to a reduction in the X-ray scattering contrast between the silica walls and pore-fill-ing material, a situation well-described in the literature, [14] and also observed for other types of materials. [15] The presence of functional groups characteristic of [complex]propyltriisopropoxysilane in the materials was confirmed by using FTIR spectroscopy. The stretching vibration modes of the mesoporous framework (SiÀOÀSi) of the grafted materials were observed at approximately 1240, 1070, and 810 cm À1 .…”