Biomedical subjects

Rowshan Ara Begum

Publications and source records attributed to Rowshan Ara Begum.

3 recordsLinked to original sources

PubMed2006

Amide-based ligands for anion coordination.

Anion recognition is an active area of research in supramolecular chemistry. The rapidly increasing amount of structural data now allows anion coordination chemistry to be formalized in terms of coordination numbers and geometries based on hydrogen-bonding interactions between the host (ligand) and the guest (anion). This Minireview targets just one class of anion receptors, namely, amide-based ligands. The structural data for a series of five anion shapes are compiled according to coordination number, and distinct commonalities are observed within a given anion topology. The results also indicate a number of similarities between the coordination of anions and transition-metal ions.

Journal Article↗

PubMed2006

Thioamide pincer ligands with charge versatility.

This paper reports the synthesis and characterization of three complexes, two palladium and one platinum, with 2,6-bis-thioamido-phenyl and 2,6-bis-thioamido-pyridine ligands. The ligands show internal charge versatility by losing protons from a phenyl CH (I) or from amide NH's (II and III). The complexes were also examined as Heck catalysts, and the palladacycle, I, was found to be more effective compared to the others. The crystal structures of the complexes are also reported.

Crystallization↗

PubMed2005

Autocatalytic alkyne cycloadditions: evidence for colloidal Pt catalysis.

Treatment of the four-membered platinacycle L2Pt(1,8-naphthalendiyl) (1) or the five-membered platinacycle L2Pt(1,12-triphenylendiyl) with excess PhCCPh at 120-150 degrees C gives the coupling products 1,2-diphenylacenaphthalene or 4,5-diphenylbenzo[e]pyrene and the alkyne complex L2Pt(eta2-PhCCPh). Both reactions show an accelerating rate, which has been traced to catalysis of the reaction by colloidal platinum formed by the reaction of O2 with L2Pt(eta2-PhCCPh).

Alkynes↗