On the basis of the appearance of ν(NtN) from 2007 to 2029 cm -1 in CD 3 CN, oxidation states at Os in cis,cis-[(

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A variety of reactions occur between trans-[OsVI(tpy)(Cl)2(N)]+ (1) (tpy = 2,2‘:6‘,2‘‘-terpyridine) or [OsVI(tpm)(Cl)2(N)]+ (2) (tpm = tris(1-pyrazolyl)methane) and N3 -. The reaction between 2 and N3 - gives the stable dinitrogen complex OsII(tpm)(Cl)2(N2), but with 1 the chemistry is solvent dependent. One-electron reduction to give trans,trans-(tpy)(Cl)2OsII(N2)OsII(Cl)2(tpy) occurs in nonpolar solvents. 1 and 2 react with N3 - in the presence of CS2 to give the thionitrosyls [OsII(L3)(Cl)2(NS)]+ (L3 = tpy, tpm), -SCN, and N2. A reaction between 1 and excess N3 - in CH3CN occurs to give the first OsIII-5-CH3-tetrazolate complex, and it has been characterized by X-ray crystallography (structure shown).

A new tetradentate asymmetric Schiff base ligand; (E)-N'-(1-(4-((E)-2hydroxybenzylideneamino)phenyl)ethylidene)morpholine-4-carbothiohydrazide (H 2 L) was prepared by consecutive condensation reactions between p-aminoacetophenone, salicylaldehyde and 4-morpholinethiosemicarbazide. The structures of the obtained ligand along with its Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Cr(III), Fe(III) and Ru(III) complexes were authenticated by different analytical and spectral techniques. The ligand behaves as a monobasic tetradentate one and chelates with metal ions through the deprotonated phenolic oxygen, imine nitrogen, thione sulfur and azomethine nitrogen atoms (ONNS chromophore). All nonelectrolyte metal complexes possess octahedral geometry, except Ni(II) and Cu(II) complexes (2, 3) which have tetra-coordinate structures. The thermal stability of metal complexes is higher than that of the free ligand and the general thermal degradation pathways were discussed based on thermogravimetric technique. The activation thermodynamic parameters as well as the order of reaction (n) were estimated from DTG curves by using Piloyan method. Thermogravimetric analyses and mass spectra of metal complexes confirm the number of solvents in their inner and outer spheres.Molecular modeling data were used to demonstrate the thermal decomposition pathways of the ligand and its metal complexes, confirming their chemical structures. The ESR spectra of Cu(II) complexes indicate that the unpaired electron is localized mainly in the d (x 2 -y 2 ) orbital with axial symmetry. Powder X-ray diffraction analyses for Co(II), Cu(II) and Ru(III) complexes (1,3,7) show that copper complex has a crystalline nature, whereas, cobalt and ruthenium complexes are amorphous. The ligand and its metal complexes were tested in vitro for their anti-molluscicidal activity against Eobania vermiculata. The results reveal that the investigated compounds have remarkable antimolluscicidal activities against the tested land snail with various sensitivity levels. The synthesized compounds were also screened in vitro for their

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