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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gavrish, Sergey P. Lampeka, Yaroslaw D. Pritzkow, Hans Lightfoot, Philip |
| Description | Author Affiliation: Gavrish SP ( L.V. Pisarzhevsky Institute of Physical Chemistry, National Academy of Science of Ukraine, Prospekt Nauki 31, 03028, Kiev-28, Ukraine.) |
| Abstract | The crystal structures of the palladium( II) complexes of the open-chain and macrocyclic ligands $PdL^{1}·3H_{2}O,$ $PdL^{2}·6H_{2}O$ and $PdL^{3}·5H_{2}O$ have been determined $(H_{2}L^{1}$ = 1,4,8,11-tetraazaundecane-5,7-dione , $H_{2}L^{2}$ = 1,4,8,11-tetraazacyclotetradecane-5,7-dione, $H_{2}L^{3}$ = 1,4,8,11-tetraazacyclotridecane-5,7-dione ). The coordination polyhedra of the palladium( II) ions in all complexes are formed by two deprotonated amide and two amine donors with Pd–N distances being similar in $PdL^{1}$ and $PdL^{2}$ and substantially shorter in $PdL^{3}.$ A detailed analysis of the $^{1}H$ NMR spectra of the macrocyclic complexes supports the formation in aqueous solution of only N- meso isomers of both compounds in agreement with the X-ray data. The spectra of the palladium( II) macrocyclic complexes are shifted downfield as a whole as compared to those of the nickel( II) analogues with the shifts being essentially non-uniform. The latter feature can be related to the differences in magnetic anisotropy of the M–N bonds. The maxima of d–d absorption bands of the palladium( II) complexes demonstrate weaker dependence on the macrocycle size as compared to those of the nickel( II) analogues. Both macrocyclic compounds $PdL^{2}·6H_{2}O$ and $PdL^{3}·5H_{2}O$ are characterized by lamellar crystal structures consisting of interleaved layers formed by macrocyclic units and by water molecules with similar metal complex layers and different 2D water sheets. A columnar crystal structure is inherent for $PdL^{1}·3H_{2}O$ with the water molecules present as discrete $(H_{2}O)_{3}$ clusters . |
| ISSN | 14779226 |
| Issue Number | 33 |
| Volume Number | 39 |
| e-ISSN | 13645447 |
| Journal | Dalton Trans. |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2010-09-07 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | Macrocyclic Compounds Chemistry Malonates Organometallic Compounds Palladium Coordination Complexes Crystallography, X-Ray Ligands Magnetic Resonance Spectroscopy Models, Molecular Molecular Structure Nickel Chemical Synthesis Pharmaceutical Solutions Solutions Water Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Inorganic Chemistry |
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