| Autor: |
Avagyan NA; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Lemport PS; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Roznyatovsky VA; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Averin AD; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Yakushev AA; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Lyssenko KA; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Perfilyev PD; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Isakovskaya KL; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119334, Moscow, Russia., Aksenova SA; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119334, Moscow, Russia.; Moscow Institute of Physics and Technology, National Research University, Institutskiy per. 9, Dolgoprudny, 141700 Moscow Region, Russia., Nelyubina YV; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119334, Moscow, Russia., Vokuev MF; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Rodin IA; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Gloriozov IP; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Ustynyuk YA; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com., Nenajdenko VG; Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia. nenajdenko@gmail.com. |
| Abstrakt: |
A new family of phenanthroline ligands was prepared. Hydrolysis of 4,7-dihalogenated 1,10-phenanthroline-2,9-diamides in acidic media leads to the formation of the corresponding 4,7-oxygenated derivatives. These ligands can exist in different tautomeric forms. The tautomerism of 4,7-oxygenated phenanthroline diamides has been investigated using quantum chemical calculations. The unsymmetrical oxo-hydroxy tautomeric form was proved to be the most energetically advantageous according to the spectral data and X-ray analysis. It was shown that 4,7-difluoro derivatives undergo acid hydrolysis more easily when compared to 4,7-dichloro derivatives. The coordination chemistry of 4,7-oxygenated 1,10-phenanthroline-2,9-diamides toward some lanthanide nitrates was investigated. The structures of Ln-complexes thus formed were studied both in the solid state and in solution (XRD analysis and IR, NMR and UV spectroscopy). It was revealed that 4,7-oxygenated ligands adopt the dihydroxy tautomeric form upon coordination with lanthanide nitrates. |
