|
عنوان
|
Modulation of coordination in pincer-type isonicotinohydrazone Schiff base ligands by proton transfer
|
|
نوع پژوهش
|
مقاله چاپ‌شده در مجلات علمی
|
|
کلیدواژه‌ها
|
2-benzoylpyridineisonicotinoylhydrazone,pyridine
|
|
چکیده
|
We present here two different coordination polyhedra of pincer type N2O hydrazone based ligands supplemented with thiocyanate ions. The compounds namely [HgIJSCN)2IJHL1)] (1) and [HgIJSCN)2IJHL2)] (2) have a common isonicotinohydrazone fragment and have been prepared by using a coordination driven self-assembly of the HgIJSCN)2 with two different ligands including 2-benzoylpyridineisonicotinoylhydrazone (HL1), and 2-acetylpyridine-isonicotinoylhydrazone (HL2). In compound 1 the ligand coordinates to the mercury center in the keto form (N–NHCO) whereas, in compound 2, the proton at the hydrazine group has been shifted to the uncoordinated pyridine ring and the ligand acted as a zwitterion. The structures provide a complementary system for proton transfer within the ligand molecule involving the keto–enol tautomerization of the amide group and 4-pyridyl N protonation. As a result, the relative location of orbitals and ligands in the complexes are different as well as the bonding strength and the coordination polyhedra. We have also studied electrostatically enhanced π⋯π (either conventional or involving the chelate ring) interactions observed in the solid state of both compounds and analyzed them using DFT calculations, molecular electrostatic potential surface and Bader's theory of atoms in molecules.
|
|
پژوهشگران
|
آنتونیو فرانترو (نفر ششم به بعد)، آنتونیو فرانچوتی (نفر ششم به بعد)، آلن کندی (نفر ششم به بعد)، فدور زوبکو (نفر ششم به بعد)، آتش قربانو (نفر پنجم)، باربارا میراسلو (نفر چهارم)، فرهاد اکبری افخمی (نفر سوم)، علی اکبر خاندار (نفر دوم)، قدرت محمودی (نفر اول)
|