Ln3I5(S2N2)(S2)(THF)10 - a new type of molecular compounds.

Unprecedented complexes of the composition Ln3I5(S2N2)(S2)(THF)10 were obtained in the reactions of neodymium and dysprosium iodide-nitrides with sulfur. The inorganic core of the molecules contains the cyclic fragments Ln(µ-S2)Ln, LnSNSN and LnSN. Ten of the fourteen atoms of the core are coplanar, the remaining four S2 and I2 atoms lie in the other two orthogonal planes. The dysprosium complex upon excitation with UV light exhibits the metal-centered luminescence characteristic of the Dy(3+) ion. Geometric parameters of the molecules, computational data, electron spectroscopy and fluorescence suggest the existence of some conjugation in the mentioned heterocycles.

Synthesis, structure and luminescent properties of lanthanide fluoroalkoxides.

Alkoxides [Ln(OR)3(DME)]2 (R = CH(CF3)2, Ln = Sm (1), Yb (2)), [Ce(OR)3(Phen)]2 (3) (Phen = 1,10-phenanthroline), [Ce(OR')3(DME)2]2 (R' = C(CF3)3) (4), {Gd(OR')3(DME)2} (5), {Ln2[O(CF3)2C­C(CF3)2O]3} (Ln = Ce (6), Gd (7)), {Ce2[O(CF3)2C­C(CF3)2O]3(Phen)2} (8), and {Ce[O(CF3)2C­C(CF3)2O][O(CF3)2­C(CF3)2OH](Phen)2} (9) were synthesized by the reactions of silylamides Ln[N(SiMe3)2]3 with respective fluorinated alcohols. The heterovalent trinuclear complex {Sm2(µ2-OR)3(µ3-OR)2Sm(OR)2(THF)2.5(Et2O)0.5} (10) was obtained by treatment of SmI2(THF)2 with ROK. The reaction of europium(II) and yttrium(III) silylamides with ROH afforded the heterobimetallic alkoxide {Eu2(µ2-OR)3(µ3-OR)2Y(OR)2(DME)2} (11) containing divalent europium. The molecular structures of 1, 2, 3, 9, 10 and 11 were determined by X-ray analysis. All the prepared cerium derivatives as well as the europium­yttrium isopropoxide upon UV excitation exhibited photoluminescence in the regions of 370­425 (for Ce3+) and 485 nm (for Eu2+) which was assigned to 4d→5f transitions.

[Effect of epidural morphine analgesia on the NO-forming activity of nociceptive neurons of the spinal ganglia and bone marrow]. / Vliianie épidural'noi anal'gezii morfinom na NO-obrazuiushchuiu aktivnost' notsitseptivnykh neironov spinal'nykh gangliev i spinnogo mozga.

The effect of epidural morphine analgesia on NO mechanisms was studied during the primary and secondary sensitizations. The nitro-oxide synthase (NOS) activity was evaluated by the method of Home and Vincent, 1989, (identification of NADPH diaphorase). NOS and NADPH diaphorases are two double enzymes in cells with a synchronously changing activity. The NOS activity is in line with the level of the NO secretion. The enzyme was measured on a microdensitometer. The findings evidence an active involvement of NO mechanisms in the formation of primary and secondary hyperalgesia, and the injection of morphine caused a significant decrease in the count of NO-expressing neurons in the total number of cells with high and average activities of the enzyme.

[Effect of epidural morphine anesthesia on NO-ergic activity of nociceptive neurons of spinal ganglia and spinal cord]. / Vliianie épidural'noi analgezii morfinom na NO-obrazuiushchuiu aktivnost' notsitseptivnykh neironov spinal'nykh gangliev i spinnogo mozga.

The effect of epidural morphine anesthesia on NO-ergic mechanisms was studied during primary and secondary sensitization. Nitro-oxide synthase (NOS) activity was evaluated by the method of Home and Vincent (1989) (identification of NADPH diaphorase). NOS and NADPH diaphorase are two double enzymes in cells with synchronously changing activity. NOS activity corresponds to the level of NO secretion. The enzyme was measured on a microdensitometer. The findings evidence active involvement of NO-ergic mechanisms in the formation of primary and secondary hyperalgesia, and injection of morphine caused a significant decrease in the count of NO-expressing neurons in the total number of cells with high and average activities of the enzyme.