The assembly reaction arising from hydrogen bonding between a chiral C3 symmetric cobalt(III) complex and a tripod-ligand involving three imidazolate groups [tris[2-(((2-methylimidazolato-4-yl)methylidene)amino)ethyl]amine]cobalt(III) and either hydroquinone or resorcinol gave the 1:3 adducts, with 3D extended structures showing the template effect of the complex.
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http://dx.doi.org/10.1039/b107741d | DOI Listing |
Acta Crystallogr E Crystallogr Commun
June 2024
Department of Chemistry University of Kentucky,Lexington KY 40506 USA.
The synthesis, crystal structure, and a Hirshfeld surface analysis of tris-{,-diethyl-'-[(4-nitro-phen-yl)(oxo)meth-yl]carbamimido-thio-ato}cobalt(III) conducted at 180 K are presented. The complex consists of three ,-diethyl-'-[(4-nitro-benzene)(oxo)meth-yl]carbamimido-thio-ato ligands, threefold sym-metric-ally bonded about the Co ion, in approximately octa-hedral coordination, which generates a triple of individually near planar metallacyclic (Co-S-C-N-C-O) rings. The overall geometry of the complex is determined by the mutual orientation of each metallacycle about the crystallographically imposed threefold axis [dihedral angles = 81.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
July 2022
Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan.
Among sulfoximine derivatives containing a chiral sulfur center, benzothiadiazine-1-oxides are important for applications in medicinal chemistry. Here, we report that the combination of an achiral cobalt(III) catalyst and a pseudo-C -symmetric H -binaphthyl chiral carboxylic acid enables the asymmetric synthesis of benzothiadiazine-1-oxides from sulfoximines and dioxazolones via enantioselective C-H bond cleavage. With the optimized protocol, benzothiadiazine-1-oxides with several functional groups can be accessed with high enantioselectivity.
View Article and Find Full Text PDFInorg Chem
November 2017
Institute of Chemistry, University of Graz, Schubertstrasse 1, 8010 Graz, Austria.
A novel selenium-containing pyridazinyl-based soft scorpionate ligand (KTnse) was synthesized. It reacts with CoCl and NiCl, yielding the first metallaboratrane complexes with selenium in their donor positions. Further substitution with Ag(OTf) or NaN allows isolation of the respective triflate or azide complexes.
View Article and Find Full Text PDFInorg Chem
August 2017
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.
Reported herein is an expanded investigation into a new method for the preparation of Co(III) cyclam bis-alkynyls (cyclam = 1,4,8,11-tetraazacyclotetradecane) under aerobic, weak base conditions. Treatment of trans-[Co(cyclam)(CAr)Cl]Cl-type complexes (Ar = CF (1a), 4-CHNMe (1b)) with AgOTf in MeCN resulted in the doubly charged complexes [Co(cyclam)(CAr)(NCMe)](OTf) (Ar = CF (2a), 4-CHNMe (2b)). These solvento complexes 2a,b undergo rapid alkynylation under aerobic conditions in the presence of an organic base and HCAr' to form the symmetrical or unsymmetrical bis-alkynyl complexes trans-[Co(cyclam)(CAr)(CAr')](OTf) (Ar/Ar' = CF (3a), 4-CHNMe (3b); Ar = CF and Ar' = 4-CHNMe (3c), CPh (3d)) in good yields.
View Article and Find Full Text PDFDalton Trans
August 2017
Department of Chemistry, IIT Madras, Chennai 600 036, India.
Two bis-tridentate chelated cobalt(ii) complexes, which differ in the ligand structure by a methylene group, activate molecular oxygen (O), and give different oxidation products. The O reaction of [Co(pepma)] (1) with unsymmetrical 2-(2-pyridyl)-N-(2-pyridylmethyl)ethanamine (pepma) results in ligand oxidation, to the corresponding Co(ii) imine complex [Co(pepmi)] (2). Contrastingly, the Co(ii) complex [Co(bpma)] (3) of similar symmetrical bis(2-pyridylmethyl)amine (bpma), undergoes metal oxidation, yielding a cobalt(iii) complex, [Co(bpma)] (4).
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