• MOHAMMAD EL-KHATEEB

      Articles written in Journal of Chemical Sciences

    • Dithiocarbonato nickel, palladium and platinum complexes bearing bis(diphenylphosphino)ferrocene: synthesis and X-ray structure determination

      MOHAMMAD EL-KHATEEB QUSAY TANASH HASSAN ABUL-FUTOUH HELMAR GORLS WOLFGANG WEIGAND

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      The dithiocarbonato metal complexes M(k2S,S-S2CO)(k2P,P-dppf) {M= Ni, Pd, Pt; dppf=bis(diphenylphosphino)ferrocene} are obtained from the reaction of the metal(II) complexes [M(K2S,S-S2-COEt)2] with the dppf ligand or from the chloride substitution of M(k2P,P-dppf)Cl2 by the O-ethyldithiocabonatoanion. These complexes are produced by C-O bond cleavage by the O-ethyldithiocarbonato anion present in solution. These new complexes have been characterized by UV-Vis, NMR, IR spectroscopy and elemental analysis. The structures of the three complexes were further confirmed by single-crystal X-ray diffraction analysis.

    • Half-sandwich iron complexes bearing vinyl-selenocarboxylato ligands

      TAGHREED AL-JAZZAZI MOHAMMAD EL-KHATEEB LAMA QURAAN HASSAN ABUL-FUTOUH HELMAR GORLS WOLFGANG WEIGAND

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      Vinyl selenocarboxylato iron complexes of the formula CpFe(CO)2SeCOCH=C(R1)(R2) {R1 = H, R2 = Me, R1 = R2 = Me, R1 = H, R2 = CH=CHMe} are synthesized by the reaction of (l-Se)[CpFe(CO)2]2 with the corresponding vinyl acid chlorides ClCOCH=C(R1)(R2). Photolytic substitutionsof CpFe(CO)2SeCOCH=CMe2 with EPh3 gave the monosubstituted complexes CpFe(CO)(EPh3)-SeCOCH=CMe2 (E = P, As, Sb) in good yields. The new complexes have been characterized by UV-Vis, IR,1H-NMR, 13C{1H}-NMR, 77Se{1H}-NMR, 31P{1H}-NMR spectroscopy and elemental analysis. The solidstate structures of CpFe(CO)2SeCOCH=CMe2 and CpFe(CO) AsPh3)SeCOCH=CMe2 were determined by X-ray crystallography. The cyclic voltammetric measurements of CpFe(CO)2SeCOCH=CMe2 were recorded.

    • Vinylic-thiocarboxylate complexes of iron: synthesis, characterization and reactions

      MOHAMMAD EL-KHATEEB KHALEEL JASALI BATOOL AL-JUNEIDI HASSAN ABUL-FUTOUH HELMAR GORLS WOLFGANG WEIGAND

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      Half-sandwich iron thiocarboxylate complexes of the general formula CpFe(CO)2-SCOCH=C(R¢)(RR¢¢){R¢ = H, R¢¢ = Me, R¢ = R¢¢ = Me, R¢ = H, R¢¢ = CH=CHMe}) are obtained from the reaction of (l-Sx)[CpFe(CO)2]2 (x = 1–5) with the vinyl acid chlorides ClCOCH=C(R¢)(R¢¢). The substitution reaction of CpFe(CO)2SCOCH=C(R)Me with EPh3 produced the monosubstituted complexesCpFe(CO)(EPh3)SCOCH=C(R)Me (R = Me, E = P, R = H, E = As, Sb). All the new complexes have been characterized by UV-Vis, IR, 1H-NMR, 13C{1H}-NMR, 31P{1H}-NMR spectroscopy and elemental analysis.The solid state structures and the cyclic voltammetric measurements of CpFe(CO)2SCOCH=CMe2 andCpFe(CO)(PPh3)SCOCH=CMe2 were determined.

    • Synthesis and characterization of platinum 1,4-bis(ethynyl)benzene complexes

      MOHAMMAD EL-KHATEEB HAYATO MORIYAMA YUKIHIRO YOSHIDA HIROSHI KITAGAWA

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      The reactions of (P)2PtCl2 with a large excess of 1,4-bis(ethynyl)benzene catalyzed with copper(I) iodide gave (P)2Pt(C≡CC6H4C≡CH)2 [P= PPh3, ½ (Ph2PC5H4)2Fe (dppf)] in high yields. The corresponding 1:2 metal to ligand ratio reaction produced unidentified orange solids. The complexes(P)2Pt(C≡CC6H4C≡CH)2 have been characterized by IR, 1H-NMR, 13C{1H}-NMR, 31P{1H}-NMR spectroscopyand elemental analysis. Their crystal structures were determined by X-ray structure determination.

      The reactions of (P)2PtCl2 with a large excess of 1,4-bis(ethynyl)benzene catalyzed with copper(I) iodide gave (P)2Pt(C≡CC6H4C≡CH)2 [P= PPh3, ½ (Ph2PC5H4)2Fe (dppf)] in high yields. The corresponding 1:2 metal to ligand ratio reaction produced unidentified orange solids. The complexes(P)2Pt(C≡CC6H4C≡CH)2 have been characterized by IR, 1H-NMR, 13C{1H}-NMR, 31P{1H}-NMR spectroscopyand elemental analysis. Their crystal structures were determined by X-ray structure determination.

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