57914-22-4Relevant articles and documents
A stannatrane-like [4.4.4.01,6] heterotricyclic stannate anion possessing rhodanide antennae: A chromoreactand for Fe3+, Cu2+ and Co2+ ions
Srivastav, Neha,Singh, Raghubir,Kaur, Varinder,Wagler, J?rg,Kroke, Edwin
, p. 54 - 60 (2017)
Exploration of an aminotrisphenol ligand (H3L) to synthesise heterocyclic tin derivatives led to the unexpected formation of a stannatrane-like [4.4.4.01,6] heterotricyclic stannate anion [LSnCl2]? (1). Further, its metathesis reaction with ammonium thiocyanate provided access to its thiocyanate derivative [LSn(NCS)2]? (2), which proved to be a chromophoric probe. The characterization methods applied, such as elemental analysis, various spectroscopic methods (FT-IR, NMR (1H, 13C, 119Sn), UV–Vis, Mass) and X-ray crystallography (for 2) are in accord with the formation of these ionic compounds. The rhodanide functionalized stannatrane-like compound (2) was isolated as triethylammonium salt with distorted octahedral environment around Sn generated by the tripodal O3N donor system and the N atoms of two cis configured thiocyanates. This particular organization of rhodanides imparted chelator and chromophoric character to 2 and enhanced its colorimetric and optical response towards some metal ions (such as Fe3+, Cu2+ and Co2+ ions) as compared to the free tripodal ligand (H3L) and ammonium thiocyanate. The role of 2 as a bidentate ligand for the chelation of metal ions may be responsible for the enhanced stability of metal complexes as well as the observed spectral behaviour.
Ti(IV)-Tris(phenolate) Catalyst Systems for the Ring-Opening Copolymerization of Cyclohexene Oxide and Carbon Dioxide
Raman, Sumesh K.,Deacy, Arron C.,Pena Carrodeguas, Leticia,Reis, Natalia V.,Kerr, Ryan W. F.,Phanopoulos, Andreas,Morton, Sebastian,Davidson, Matthew G.,Williams, Charlotte K.
, p. 1619 - 1627 (2020/02/27)
Titanium(IV) complexes of amino-tris(phenolate) ligands (LTiX, X = chloride, isopropoxide) together with bis(triphenylphosphine)iminium chloride (PPNCl) are active catalyst systems for the ring-opening copolymerization of carbon dioxide and cyclohexene oxide. They show moderate activity, with turnover frequency values of ～60 h-1 (0.02 mol % of catalyst, 80 °C, 40 bar of CO2) and high selectivity (carbonate linkages >90%), but their absolute performances are lower than those of the most active Ti(IV) catalyst systems. The reactions proceed with linear evolution of polycarbonate (PCHC) molar mass with epoxide conversion, consistent with controlled polymerizations, and evolve bimodal molar mass distributions of PCHC (up to Mn = 42 kg mol-1). The stoichiometric reaction between [LTiOiPr] and tetraphenylphosphonium chloride, PPh4Cl, allows isolation of the putative catalytic intermediate [LTi(OiPr)Cl]-, which is characterized using single-crystal X-ray diffraction techniques. The anionic titanium complex [LTi(OR)Cl]- is proposed as a model for the propagating alkoxide intermediates in the catalytic cycle.
CYTOTOXIC TITANIUM AND VANADIUM COMPLEXES
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Paragraph 0300, (2015/12/31)
The present application provides a family of highly resistant and water-stable Titanium and Vanadium complexes, which may be administered directly without a further hydrolysis step and which solubility and cell-penetration characteristics may be modifiabl
