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Unformatted text preview: dene) hydrazine carbodithioate (S4MB3PT) and S-2-methylbenzyl-2-(pentan-3-ylidene) hydrazinecarbodithioate (S2MB3PT) confirmed that these Schiff bases exist in the thione form in a monoclinic and triclinic system respectively. The Ni(II) and Zn(II) complexes of S2MB3PT confirmed that they possess four-coordinate distorted square planar and tetrahedral geometries respectively whereas the Cu(II) complex derived from the S2MB2PT was centrosymmetric with a square -planar geometry. The Ni(II) complexes derived from S-benzyl-2-(pentan-n-ylidene) hydrazine carbodithioate (NiSB2PT and NiSB3PT) also possessed square planar geometries. The crystal structure analyses showed that the central metal ions were coordinated to the Schiff bases via the azomethine nitrogen and the thiolate sulphur. Assignments of the geometries for the remaining complexes are supported by magnetic and spectral evidence. Biological studies are being assessed for further investigation on structure -activity relationship. 129 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia INO-O14 IRON(II) SPIN-CROSSOVER IN BENZOTRIAZOL DERIVED LIGAND 1 WMM Al-Samsi, MRA Al-Mandhary, A Gismelseed, Al-Omari and NK Al-Rasbi 1 2 1 Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Al -Khod 123, Muscat, Sultanate of Oman 2 Department of Physics, College of Science, Sultan Qaboos University, P.O. Box 36, Al Kho d 123, Muscat, Sultanate of Oman E-mail: [email protected] A novel mononuclear iron(II) complex [(Fe(L) 3(NCS)2)]L where L = 1-pyridine-2-yl-benzotriazole has been synthesized and characterized by X-ray crystallography, magnetic susceptibility measurements, Mössbauer spectroscopy and various other spectroscopic methods. The crystal structure of the complex at 100 K indicates a pseudo-octahedral geometry with two ligands adopting mono-dentate mode via the – benzotriazole units in trans-position while the third ligand is chelating, and the NCS groups are in cisposition. The fourth ligand is not coordinated to the metal but is Π - Π stacked to two mono-dentate ligands of different coordination spheres. The Fe-N bond lengths range from 2.011...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11