Talal A. K. Al-Allaf

Applied Science Private University, `Ammān, Amman, Jordan

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Publications (57)79.11 Total impact

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    ABSTRACT: Several palladium(II) and platinum(II) complexes analogous to oxaliplatin, bearing the enantiomerically pure (1R,2R)-(−)-1,2-diaminocyclohexane (DACH) ligand, of the general formula {MX2[(1R,2R)-DACH]}, where M = Pd or Pt, X (COO)2, CH2(COO)2, , , {1,1′-C5H8(CH2COO)2}, [1,1′-C6H10(CH2COO)2], [1,1′-(COO)2ferrocene], , , , MeCOO and Me3CCOO, were synthesized. All the complexes prepared were characterized physicochemically and spectroscopically. Some selected complexes were screened in vitro against several tumor cell lines and the results were compared with reference standard drug, oxaliplatin. Copyright © 2009 John Wiley & Sons, Ltd.
    No preview · Article · May 2009 · Applied Organometallic Chemistry
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    ABSTRACT: The reaction of Na2PdCl4 with 4,5-diphenyl-1,2,4- triazole-3-thione (LH) in acetone gave cis-[PdCl2(LH)2]. Stirring cis[PdCl2(LH)2] in methanol gave a diamagnetic cis-[PdL2]. Reaction of cis[PdL2] with diphosphines gave diamagnetic complexes of the type [PdL2(diphos)] where diphos = 1,2-bis(diphenylphosphino)methane (dppm), 1,2-6(diphenyl-phosphino)ethane (dppe) or 1,2-bis(diphenylphosphino)-propane (dppp). The complexes cis-[PdCl 2(LH)2] and cis-[PdL2(diphos)] have been used effectively to prepare bimetallic complexes of the type cis-[Cl 2Pd(μ-LH)2M′Cl2] where M′ = Co, Ni, Mn or SnCl2 and [(diphos)Pd(μ-L)2M′ Cl 2] where M′ = Co or Ni, the prepared complexes were characterized by elemental analysis, magnetic susceptibility, IR, UV-Vis, 1H and 31P-{1H} NMR spectral data.
    No preview · Article · May 2007 · Asian Journal of Chemistry
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    Subhi A. Al-Jibori · Ali I. Abdullah · Talal A. K. Al-Allaf
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    ABSTRACT: Palladium(II) and platinum(II) complexes containing mixed ligands N-(2-pyridyl)acetamide (AH) or N-(2-pyrimidyl)acetamide (BH) and the diphosphines Ph2P(CH2) n PPh2, (n = 1, 2 or 3) have been prepared. The prepared complexes [Pd(A)2(diphos)] or [Pd(B)2(diphos)] have been used effectively to prepare bimetallic complexes of the type [(diphos)Pd(μ-L)2M′Cl2] where M′ = Co, Cu, Mn, Ni, Pd, Pt or SnCl2; L = A or B. The prepared complexes were characterized by elemental analysis magnetic susceptibility, i.r. and UV–Vis spectral data. 31P–{1H}-n.m.r. data have been applied to characterize the produced linkage isomers.
    Full-text · Article · Mar 2007 · Transition Metal Chemistry
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    ABSTRACT: Palladium(II) and platinum(II) complexes containing the mixed ligands tertiary diphosphines Ph2P(CH2) n PPh2, (n = 1–4) and benz-1,3-imidazoline-2-thione, benz-1,3-oxazoline-2-thione or benz-1,3-thiazoline-2-thione have been prepared and characterized by elemental analysis, magnetic susceptibility, molar conductance and i.r. spectral data. 31P–{1H}-n.m.r. data have been applied to characterize the produced linkage isomers.
    Full-text · Article · Mar 2007 · Transition Metal Chemistry
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    ABSTRACT: Potassium salt of the ligand 4,5-diphenyl-1,2,4-triazole-3-thione (LK) reacts with K2PtCl4 to give trans-[PtL2], in which (L) behaves as a bidentate chelating ligand coordinated to platinum through the nitrogen atom no.2 of the triazole ring and the sulphur of the thiolate group. Reaction of trans-[PtL2] with the diphosphine Ph 2P(CH2)n PPh2 (n = 1, 2 or 3) gave the mixed ligand complexes [PtL2(diphos)]. The produced isomers are either a single isomer, the S,S-bonded (when n = 1 or 3) or a mixture of two linkage isomers, the S,S-bonded and the N,N-bonded isomers (when n = 2). However, a reaction of [PtCl2(diphos)] with LK gave rather different isomers, two isomers in each case. The N,N-bonded and the N,S-bonded isomers, where n = 1 or 2 and the S,S-bonded and the N,S-bonded isomers where n = 3. The prepared complexes have been identified by elemental analysis, IR, UV/Vis, 1H and 31P NMR spectra. The 31P NMR data have been used effectively to identify the produced linkage isomers.
    No preview · Article · Mar 2007 · Asian Journal of Chemistry
  • Nabeel H. Buttrus · Mohammed M. Suliman · Talal A. K. Al-Allaf
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    ABSTRACT: Some new tin(IV) compounds of the general formula Sn(SC6H4R)4, where R = o-NH2, p-Me, p-Bu-t have been obtained from the direct reaction of (RC6H5S)2 and tin metal in the molar ratio 2:1 in refluxing toluene. Similarly, a mixture of tin (RC6H5S)2 and iodine in 1.0:1.5:0.5 or 1.0:1.0:1.0 molar ratios in refluxing toluene leads to the formation of Sn(SC6H4R)3I or Sn(SC6H4R)2I2 respectively. Complexes of the new tin compounds with triphenylphosphine, 4-picoline, 1,10-phenanthroline and 2,2′-bipyridine have been synthesized by the direct reaction between the tin compound and the neutral ligand. The tin compounds and their adducts have been characterized physio-chemically and spectroscopically.
    No preview · Article · Feb 2007 · Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry
  • S.A. Saleh · L.J. Rashan · T.A.K. Al-Allaf
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    ABSTRACT: Several platinum(II) and palladium(II) complexes of the general formula cis-[MLL′X2]. M = Pt or Pd, L = L′ = DMSO, X = Cl, 1/2C2O4, 1/2(OCO)2-CCH2CH 2CH2, 1/2[(OCO)CH=CH(OCO)], (OCO)C6H 11 ; M = Pt or Pd, L = DMSO, L′ = harmaline or harmine, X = Cl, 1/2C2O4, 1/2(OCO)2-CCH2CH 2CH2; M = Pt, L = 3,5-dimethylpyrozole, L′ = harmine; and trans-[Pd(3,5-dimethylpyrazole)2Cl2)] have been prepared and characterized physicochemically and spectroscopically. These complexes together with the antibiotic ciprofloxacin and antifungal miconazole nitrate were tested for their antimicrobial activity against the two gram-negative bacterial species, Escherichia coli and Pseudomonas aeruginosa, and the gram-positive bacterial species, Staphylococcus aureus and the fungal species, Candida albicans. The results obtained were compared with those of the platinum complexes, cisplatin, carboplatin and oxaliplatin; the known anticancer drugs.
    No preview · Article · Apr 2005
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    J Al-Hayaly · Nabeel H Buttrus · Farah Tarq · Talal A K Al-Allaf
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    ABSTRACT: Tin metal reacts with dianiline disulfide in refluxing toluene to give the compound tetrakis(o-aminophenythiolato)tin(IV), [Sn(SC 6 H 4 NH 2 -o) 4 ], through an oxidative addition reaction. Trinuclear complexes of the general formula [Sn(SC 6 H 4 NH 2 -o) 4 (MCl 2) 2 ] {M = Ni(II), Pd(II) or Pt(II)} were prepared by a direct reaction of NiCl 2 .6H 2 O, Na 2 PdCl 4 or K 2 PtCl 4 with the tin compound. Adducts of the above trinuclear complexes with the diphosphines: bis(diphenylphosphino)methane (dppm) or bis-(diphenylphosphino)ethane (dppe) were also prepared. The prepared complexes and their adducts were characterized by their elemental analyses, IR and UV/Vis spectroscopy, conductivity and magnetic measurements.
    Preview · Article · Jan 2005
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    Othman H Amin · Lamaan J Al-Hayaly · Subhi A Al-Jibori · Talal A.K Al-Allaf
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    ABSTRACT: The complexes [ML(2)A(2)] or [ML2B] where M = Pd or Pt, L = 5-phenyl-1,3,4-oxadiazole-2-thione ion, A = tertiary monophosphines and B = tertiary diphosphines have been used effectively to prepare bimetallic complexes of the type [A(2)M(mu-L)(2)M'Cl-2] or [BM(mu-L)(2)M'Cl-2], where M' = Co, Pd or SnCl2. The prepared complexes were characterized by elemental analysis, magnetic susceptibility, IR and UV-Vis spectral data. P-31-{H-1} NMR data have been applied to characterize the produced linkage isomers.
    Full-text · Article · Jul 2004 · Polyhedron
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    ABSTRACT: Several new platinum(II) complexes of the general formulae cis-[PtCl(2)(DMSO)L], where L is a Schiff base or hydrazone derived from tetrazolo[1,5-a]quinoline-4-carboxaldehyde as carrier ligands, have been synthesized and characterized physicochemically and spectroscopically. These platinum complexes which are structurally analogues to what so called cisplatin [cis-[PtCl2(NH3)2]; the first generation anticancer agent] were evaluated for their cytotoxicity on HL-60 (human promyelocytic leukemia) cells. Two of the platinum complexes were almost similar in their activity to cisplatin, while the remaining three complexes have demonstrated higher efficacy than that of cisplatin. Based on our findings, these novel platinum complexes appear to be valuable leading compounds with high efficacy.
    No preview · Article · Jul 2004 · European Journal of Medicinal Chemistry
  • O.H. Amin · L.J. Al-Hayaly · S.A. Al-Jibori · T.A.K. Al-Allaf
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    ABSTRACT: Reaction of potassium salt of the ligand 5-phenyl-1,3,4-oxadiazole-2-thione (LH) with NiCl2.6H2O gave the chelate complex [NiL2]. Recrystalization of [NiL2] from CH2Cl2 or reaction of the ligand (LH) with NiCl2.6H2O gave the tetrahedral hydroxy nickel(II) complex [Ni(OH)(L)(LH)]. Reaction of either [NiL2] or [Ni(OH (L)(LH)] with tertiary monophosphine (PR3) or diphosphines (diphos) gave complexes of the types [NiL2(PR32], (PR3 = PMePh2 or PEt3) or [NiL2 (diphos)] {diphos = Ph2PCH2PPh2 (dppm) or Ph2PCH2CH2PPh2 (dppe)}. Treatment of either [NiL2(PR3)2] or [NiL2(diphos)] with the metal chlorides CoCl2.6H2O, trans-[PdCl2 (DMSO)2] or SnCl4.5H2O gave heterobimetallic complexes of the type [(Y)Ni(μ-L)2MCl 2].nH2O, where Y = (PR3)2 or diphos and M = Co, Pd or SnCl2 . The prepared complexes were characterized by elemental analysis, molar conductance, IR, UV-Vis and magnetic susceptibility.
    No preview · Article · Jan 2004
  • Talal A. K. Al-Allaf · Luay J. Rashan · Axel Stelzner · Douglas R. Powell
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    ABSTRACT: Several Schiff bases derived from salicylaldehyde and aminopyridines were found to coordinate with Me2SnCl2 in 1:1 or 1:2 (tin:base) molar ratio in diethylether, depending on the nature of the Schiff base used, to form complexes of the general formula Me2SnCl2·L or Me2SnCl2·2L respectively. These Schiff bases coordinate with Ph2SnCl2 in a similar manner, but if the reaction is carried out in chloroform or if the product formed in ether is dissolved in chloroform then colourless to pale yellow crystals precipitated. The latter were analysed and found to be due to the ionic compounds [H2NpyN–H+]2 [Ph2SnCl4]2− which were formed as a result of an unusual cleavage of the CN bond of the Schiff bases. The Schiff bases, their Me2SnCl2 complexes and the ionic compounds were analyzed physicochemically and spectroscopically. The crystal structures of two of the ionic compounds showed that the cation [H2NpyN–H+] binds with the anion [Ph2SnCl4]2− via hydrogen bonds. The Schiff bases, their Me2SnCl2 complexes and the ionic compounds were screened against the three tumour cell lines, L929, K562 and HeLa, and the results were compared with those of the anticancer drugs, cisplatin, carboplatin and oxaliplatin. Copyright © 2003 John Wiley & Sons, Ltd.
    No preview · Article · Dec 2003 · Applied Organometallic Chemistry
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    ABSTRACT: Several new PtII and PdII complexes bearing the enantiomerically pure (1R,2R)-(-)-l,2-cyclohexanediamine (dach) ligand, of general formula [MX2{(1R,2R)-dach}], where M = Pt or Pd, X2 = cis- or trans- or (1R,2R)-1,2-cyclohexyldicarboxylate anions, have been synthesized and characterized physicochemically and spectroscopically. These complexes have been screened in vitro against the three tumour cell lines K562, HeLa and L929, and the results obtained were compared with those of the reference standards, cisplatin, carboplatin and oxaliplatin; the known antitumour drugs. The single crystal X-ray structure determination of the [Pt(C2O4)(cis-dach)] complex has been discussed and compared with that of oxaliplatin, [Pt(C2O4){(1R,2R)-dach}].
    No preview · Article · Sep 2003 · Transition Metal Chemistry
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    ABSTRACT: Treatment of the complexes [MCl2(DPPF)] (M=Pt or Pd) {readily prepared in high yield from [MCl2(DMSO)2] (M=Pt (cis-) or Pd (trans-) and DPPF in CHCl3} with two molar proportions of AgNO3 in H2O did not give the expected cation [M(DPPF)(H2O)2]2+ in solution. Instead the unusual homobimetallic bridged complex [{M(μ-OH)(DPPF)}2](NO3)2 was formed as an insoluble solvolysis solid product. Hence, carboxylation by addition of carboxylate anions to the solution cannot be carried out by this method. In contrast, the complex [PtCl2(DPPF)] reacted readily with two molar proportions of AgOAc or one of Ag2{1,1′-(OOC)2fc} (fc=ferrocene-2H) in acetone to give the corresponding carboxylato complexes. Other carboxylato complexes were obtained from the reaction of the complexes [MCl2(DPPF)] and the K-salts of e.g. (COOH)2, CH2(COOH)2, and in H2O. With few exceptions, neither the K- nor the Ag-salts of the acids Me3CCOOH and C6H11COOH react completely with [MCl2(DPPF)] in aqueous or non-aqueous solutions. However, the required products were obtained by displacement of DMSO from the corresponding carboxylato complexes by DPPF in CHCl3. All of the new carboxylato complexes and the solvolysis products were characterized physicochemically and spectroscopically. The X-ray structures of [Pt{(OOC)2}(DPPF)] and of [PtCl(NO3)(DPPF)] were determined, to obtain some additional information on the coordination mode of the unsymmetrical DPPF ligand in this type of complexes.
    No preview · Article · Jul 2003 · Journal of Organometallic Chemistry
  • Adnan S Abu-Surrah · Talal A. K Al-Allaf · Martti Klinga · Markku Ahlgren
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    ABSTRACT: The nucleophilic substitution reaction of the enantiomerically pure ligand, (1R,2R)-(−)-1,2-diaminocyclohexane [DACH] (1) with cis-bis(benzonitrile)palladium(II) dichloride [(PhCN)2PdCl2] leads to the formation of the complex [(DACH)PdCl2] (2) in a high yield. The reaction of the corresponding platinum(II) complex [(PhCN)2PtCl2] with DACH, under the same reaction conditions, surprisingly, took a different course, in which nucleophilic addition to the benzonitrile ligand occurred forming an enantiomerically pure amidine complex [(PhCNHNH(C6H10)NH2)Pt(NCPh)Cl]Cl (3), where the nitrogen ligand form a seven-membered chelate around the central atom. The aqua and oxalato derivatives of complex 2, [(DACH)Pd(H2O)2](NO3)2 (4) and [(DACH)Pd(C2O4)] (5) have also been prepared and characterized. The platinum analogue complex to 5, [(DACH)Pt(C2O4)] (6), was prepared starting from the enantiomerically pure isomer (1) and the platinum salt K2PtX4 (X=Cl, I). According to X-ray structural analysis carried out on the complex, the product does not consist of just the desired isomer, but a mixture of both the trans-l (trans-(−)-1R,2R) and trans-d (trans-(+)-1S,2S) isomers. No retention of optical isomerism was observed. The single crystal structural analysis was also carried out on the ligand N,N′-(1R,2R)-(−)-diaminocyclohexane dihydrochloride (DACH·2HCl)] (1a). The result indicates, however, that only the R,R-isomer exists in the free ligand.
    No preview · Article · Jun 2003 · Polyhedron
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    Talal A.K. Al-Allaf
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    ABSTRACT: The stannylenes R2Sn, (R = N(SiMe3)2 or CH(SiMe3)2) insert into M-X bonds of complexes [MX2L2] to give new complexes of the general formula [MX(SnR2X)L2], (M = Pt, Pd, Ni; X = Cl, N3, NO2; L = PEt3, PBu3, DPPE). They also insert into Pt-Cl bonds of the bridged complexes [{Pt(μ-Cl)Cl(L)}2], to give the new bridged complexes[ &lcub Pt(μ-Cl)(SnR2Cl)(L)}2], (R = N(SiMe3)2, L = PEt3, PBu3, PMe2Ph, PPh3), in which the bridge remained uncleaved. In one reaction of the stannylene R2Sn, where R = CH(SiMe3)2, the bridged complex [{Pt(μ-Cl)(SnR2Cl)(PEt3)}2] undergoes cleavage followed by migration of Cl to give [PtCl(SnR2Cl)( η2-SnR2)(PEt3)]. Further, the bridged complex [{Pt(μ-Cl)(SnR2Cl)(PEt3)}2], (R = N(SiMe3)2), with the neutral ligands L`, (L` = PPh3, pyridine or AsPh3), undergoes bridge cleavage to form the complexes [PtCl(SnR2Cl)(PEt3)(L`)]. The reaction of the stannylene R2Sn, (R = N(SiMe3)2) with the platinum(0) complexes [Pt(C2H4)(PPh3)2] and [Pt(COD)2], COD = 1,5-cyclooctadiene is described. The complexes obtained have been characterised mainly by 31P NMR spectroscopy and elemental analysis.
    Preview · Article · Dec 2002 · Journal of Chemical Research
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    ABSTRACT: The palladium(II) complex trans-bis[(R)-(+)-bornylamino]palladium(II) dichloride was synthesised and characterised. The solid state structure of the complex was determined by X-ray structure analysis. The compound crystallises in the monoclinic space group P2(1) with a=12.383(2), b=23.689(5), c=12.769(3) A, beta=93.25(3) degrees, and V=3739.6(13) A(3). The complex was tested for its cytotoxicity against L(929), K(562) and HeLa cell lines using the MTT assay technique. It is also tested for its anticomplementary activity using a test that detects complement proteins inhibition. These activities were compared with those of the reference standards, cisplatin, carboplatin and oxaliplatin. The significance of these results is given and discussed.
    No preview · Article · Dec 2002 · European Journal of Medicinal Chemistry
  • Talal A. K Al-Allaf
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    ABSTRACT: The R2Sn moieties formed when the cyclic compounds (R2Sn)n, R=Me or Ph, n=6; R=Et, n=9, are exposed to light, react with the platinum(II) complexes [PtCl2L2], L=PEt3, PPr3, PBu3, PEtPh2, PPh3 to give new complexes of the general formula [PtCl(SnR2Cl)L2]. Similarly, Et2Sn from (Et2Sn)9 reacts with [PtMe(Cl)L2] to give [PtMe(SnEt2Cl)L2] and Ph2Sn from (Ph2Sn)6 reacts with [PtPh(Cl)L2] or [PtPh2L2] to give [PtPh(SnPh2Cl)L2] or [PtPh(SnPh3)L2] (L=PEt3), respectively. Reactions involving (R2Sn)n and the bridged complex [{Pt(μ-Cl)ClL}2] give a mixture of [PtCl(SnR2Cl)L2] and [PtCl(SnRCl2)L2], R=Me or Et, L=PBu3. It is suggested that these reactions initially involve insertion of R2Sn moieties into PtCl bonds of the complexes [PtX(Cl) L2] or [{Pt(μ-Cl)ClL}2] then generate R2SnXCl (X=Cl, Me, Ph) and the Pt(0)complex [PtL2], which undergoes oxidative-addition of the formed tin(IV) species to give complexes containing PtSn bonds. With (Ph2Sn)6 and [PtPh2L2], the mechanism takes a different course. Reactions under similar conditions involving the Pt(0) complexes [Pt(C2H4)(PPh3)2] or [Pt(COD)2], (COD=1,5-cyclooctadiene) and (R2Sn)6, R=Me or Ph, gave no detectable complexes containing PtSn bonds. The complex [Pt(PEt3)4] and (MeSn)6 likewise gives no species containing PtSn bonds but with (Ph2Sn)6, two complexes, tentatively identified as trans-[PtPh(Sn2Ph5)(PEt3)2] and trans-[PtPh(Sn6Ph11)(PEt3)2], were detected in the solution. In all cases, the products were identified by 31P-NMR spectroscopy.
    No preview · Article · Jul 2002 · Journal of Organometallic Chemistry
  • L.J. Al-Hayaly · N.H. Buttrust · T.A.K. Al-Allaf
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    ABSTRACT: Homobinuclear complexes of the type [Cl2MR2C=CR2MCl2] [M = Ni(II), Pd(II) or Pt(II) and R = 5-phenyl-1,3,4-oxadiazole-2- thiol; 4,5-diphenyl-1,2,4-triazole-3-thiol or mercaptobenzothiazole], have been prepared by the reaction of newly prepared sulphur containing ligands of the type R2C=CR2 with the appropriate metal salts of Ni(II), Pd(II) or Pt(II). The complexes have been characterized on the basis of their CHN elemental analysis, molar conductivity, room temperature magnetic moment, I.R. and electronic spectra. Octahedral enviroment around Ni(II) while square-planar geometry around Pd(II) or Pt(II) have been deduced on the basis of magnetic and spectral studies.
    No preview · Article · Jul 2002
  • I.A. Mustafa · B.K. Al-Asa'ady · T.A.K. Al-Allaf
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    ABSTRACT: The reaction between 3,3′-diaminobenzidine and salicylaldehyde in 1:4 molar ratio affords a novel tetrabasic octadentate Schiff base (H4L). Its reaction with Ni(OAc)2 or Zn(OAc)2 in 1:2 molar ratio leads to the formation of dinuclear complexes of the general formula [M2L] and the latter, in turn, reacts with the metal halide M′X2 (M′ = Co, Ni, Cu, X = Cl or Br) in 1:2 molar ratio to form tetranuclear complexes of the general formula [M2LM′2X4]. The coordination of the Schiff base in the dinuclear complexes seems to occur via N-azomethine followed by deprotonation of the OH groups, while the further coordination in the tetranuclear complexes seems to take place via the lone pair of electrons available on the oxygen atoms. The structural features of the chelates have been confirmed by elemental analytical data, IR, UV-Vis and magnetic measurement.
    No preview · Article · Apr 2002 · Asian Journal of Chemistry

Publication Stats

518 Citations
79.11 Total Impact Points

Institutions

  • 2005-2009
    • Applied Science Private University
      `Ammān, Amman, Jordan
  • 1986-2007
    • University of Mosul
      • • College of Sciences
      • • College of Education
      • • Department of Biology
      Al Mawşil, Nīnawá, Iraq
  • 2004
    • King Faisal Specialist Hospital and Research Centre
      • Department of Biological and Medical Research
      Ar Riyāḑ, Ar Riyāḑ, Saudi Arabia
  • 2003-2004
    • Jordan University of Science and Technology
      • Department of Chemistry
      Arbēla, Irbid, Jordan
  • 1998-2003
    • Amman Arab University
      `Ammān, Amman, Jordan
  • 2001-2002
    • University of Jordan
      • Faculty of Science
      `Ammān, Amman, Jordan