Dr. SAJI P. VARKEY











 

Instut für
Anorganische Chemie
der Universität Göttingen,
Tammannstraße-4,
37077 Göttingen
GERMANY

  

Fax: 49-551-393373
Email: svarkey@shelx.uni-ac.gwdg.de
sajip@hotmail.com
Phone: 49-551-393323(work)
: 49-173 4300 314(Residence)

Technical interest

Education

Awards/Fellowships

Experience

Personal
Marital status:Unmarried
Nationality:Indian
Date of birth:25/12/1967
Present position:Alexander von Humboldt Research Fellow
Languages known:English, Hindi, Malayalam, German

References
  1. Prof. Herbert W. Roesky
    Director
    Institut fur Anorganische
    Chemie der Universität
    Göttingen,
    Tammannstrabe 4
    37077 Göttingen
    Germany
    Fax: 49-551 393 373
    Email: hroesky@gwdg.de
  2. Paul Ratnasamy
    Director
    National Chemical Laboratory
    Pune-411 008
    India
    Fax: 91-212 330233
    Email: prs@ems.ncl.res.in
  3. Prof. Moty Herskowitz
    Director
    Blechner Center for Industrial Catalysis & Process Development
    Ben Gurion University of the Negev, Beer Sheva-84105
    Israel.
    Fax: 972-07-6472902
    Email: herskow@bgumail.bgu.ac.il
  4. Prof. Jonathan Philips
    Chemical Engineering Division
    Pennsylvania State University
    120 Fenske Laboratory
    University Park, PA 16802- 4400,
    USA
    Fax: (814)865-7846
    Email: pwa@psu.com

LIST OF PUBLICATIONS/PATENTS
  1. Platinum wet deposition on Si-MCM-41 by ion exchange, reduction and their catalytic performances in cynnamaldehyde hydrogenation and n-butane hydrogenolysis. Landau, M., Saji P.Varkey and M. Herskowitz: Microporous and Mesoporous Materials (In Press)1999.
  2. Wetting stability of Si-MCM-41 mesoporous materials in neutral, acidic and basic aqueous solutions. Landau, M., Saji P.Varkey, M. Herskowitz, O. Regev, Sen T. and Z. Luz : Microporous and Mesoporous Materials (In Press)1999.
  3. Catalytic oxidation of p-xylene to p-toluic acid. Jacob, C.R, Saji P. Varkey and Ratnaswamy P., Applied Catal.(In Press ) 1999.
  4. Direct catalytic oxidation of methane to methanol over zeolite encapsulated manganese and copper complexes. Saji P. Varkey and Jacob, C.R, Indian J. Chem., 1999,38A,320-326.
  5. Zeolite-encapsulated manganese(III)salen complexes. Synthesis, Characterization and catalysis. Saji P. Varkey, Jacob, C.R. and Ratnasamy, P. : J. Mol. Catal., 1998,135,295-306.
  6. Selective oxidation over copper and manganese encapsulated in zeolites. Jacob, C.R, Saji P. Varkey and Ratnaswamy P., Microporous and mesoporous Materials., 1998,22,465-474.
  7. Selective oxidation of styrene using zeolite encapsulated manganese complexes. Saji P. Varkey and Jacob, C.R.; Indian J. Chem., 1998,37A,407-412.
  8. Zeolite-encapsulated copper(X2-salen)complexes. Synthesis and characterization. Jacob, C.R., Saji P.Varkey and Ratnasamy, P.;Applied Catal., 1998,168,353-364
  9. Tetraoxotetramine macrocyclic complexes. Khan, T.A., Rather, M.A., Jahan, N., Saji P. Varkey and Shakir, M.; Transition Met. Chem., 1998,23(3)283-285.
  10. Synthesis and spectroscopic studies of bis[macrocyclic]dimetal(II)complexes based on 14-18 membered pentaaza unit. Shakir M, Mohammed A.K., Saji P. Varkey and Nasman O.S.M; Synth. React. Inorg. Met. Org. Chem.,1998,28(1),135-151
  11. 19-Memberd pentaazamacrocyclic complexes bearing tetraamide groups. Nasman O.S.M, Barak R.M, Khaldi A.A, Elnahhal I, Saji P. Varkey and Shakir M; Transition Met. Chem., 1997,22(3),273-276.
  12. Template synthesis and spectroscopic studies of highly congugated tetraiminetetraamide macrocyclic complexes from1,2-diphenylethane-1,2-dione dihydrazone.Khan, T.A., Hasan, S.S., Saji P. Varkey., Rather, M.A. and Shakir, M.; Transition Met. Chem., 1997,22(1),4-8.
  13. Synthesis and structural studies of bis (macrocyclic)dimetal(11) complexes based on the13-membered pentaaza unit. Khan, T.A., Rather, M.A., Jahan, N., Saji P. Varkey and Shakir, M.; Synth. React. Inorg. Met. Org. Chem., 1997,27(6), 843-854.
  14. Self condensation of orthoaminobenzoic acid in the presence of metal ions.Shakir, M., Nasman, O.S.M., Mohammed, A.K. and Saji P. Varkey; Polyhedron,1996,15, 2869-2874.
  15. Spectroscopic studies of tin-transition metal heterobimetallic adducts. Khan, T.A., Rather, M.A.,Saji P. Varkey, Hasan, S.S. and Shakir, M; Main Group Metal Chem.,1996,19(4), 225-230.
  16. Incorporation of peptide bonds in the synthesis of polyazamacrocyclic adducts. Khan, T.A., Hasan, S.S., Saji P. Varkey, Rather, M.A. and Shakir, M; Transition Met. Chem., 1996,21, 283-286.
  17. Cobalt(11), nickel(11),copper(11) and zinc(11) complexes of 14 to 16 - membered Tetraazamacrocycles bearing diamide groupes: synthesis and characterization. Shakir, M., Nasman, O.S.M., Mohammed, A.K. and Saji P. Varkey ; Synth. React. Inorg. Met. Org. Chem.,1996,26(6),1035-1052.
  18. Studies on the interaction of iron(11), nickel(11), copper(11) and zinc(11) with tetraaza macrocycles bearing diamide groups.Shakir, M., Saji P. Varkey and Nasman, O.S.M.(1996): Indian J. Chem.,1996,35A,671-676.
  19. N5,17,18-membered pentaazamacrocyclic complexes bearing diamide groups : synthesis and characterization. Shakir,M., Nasman, O.S.M., Mohammed, A.K. and Saji P.Varkey; Indian J. Chem.,1996,35A,710-713.
  20. Synthesis and characterization of 14-16 membered tetraazamacrocyclic transition metal complexes bearing diamide groups. Shakir,M., Mohammed, A.K., Nasman, O.S.M. and Saji P. Varkey; Synth. React. Inorg. Met. Org. Chem., 1996,26(5)855-870.
  21. Synthesis and structural studies of bis (macrocyclic ) dimetal(11) complexes based on 14-18 membered pentaaza unit. Shakir,M., Mohammed, A.K., Saji P. Varkey and Nasman, O.S.M. ; Indian J. Chem., 1996,35A,935-939.
  22. Transition metal complexes of 13-14 membered tetraazamacrocycles: synthesis and characterization.Shakir,M., Nasman, O.S.M., Mohammed, A.K. and Saji P. Varkey: Polyhedron,1996,15,1283-1287.
  23. Organotin-transition metal complexes of 18-membered binuclear hexazamacrocycles: synthesis and characterisation. Shakir, M., Saji P. Varkey, Nasman, O.S.M. and Mohammed, A.K.; Synth. React. Inorg. Met. Org. Chem., 1996,26(3),509-528.
  24. Binucleating N6 22-membered macrocyclic transition metal complexes : synthesis and characterization. Shakir, M., Saji P. Varkey and Nasman, O.S.M.; Polyhedron 1996,15,309-314.
  25. Synthesis and electrochemical studies of a new series of pendant armed hexaazamacrocyclic transition metal complexes. Shakir,M., Mohammed, A.K., Saji P. Varkey and Siddiqi, Z. A.; Transition Met. Chem.,1996,21,162-165.
  26. Template synthesis and characterization of Rh(III), Ir(III) and Pt(II) tetraazamacrocyclic complexes.Shakir, M., Nasman, O.S.M., Mohammed, A.K. and Saji P. Varkey; Synth. React. Inorg. Met. Org. Chem.,1996,25(10)1671-1684.
  27. Preparation and structural characterization of 14-16 membered pendent arm macrocyclic complexes of transition metal ions. Shakir,M., Mohammed, A.K., Saji P. Varkey, Nasman, O.S.M. and Siddiqi, Z. A.; Polyhedron,1995,14,1277-1282.
  28. Organotellurium(IV)derivatives: Synthesis and characterization of metal dialkyltetrakis(chlorosulphato)tellurate(IV), M2[R2Te(SO3Cl)4] [M= Na, K and Sn[R2Te(SO3Cl)4]. Shakir, M., Hammed, P. S., Firdaus, F. and Saji P. Varkey; Polyhedron,1995,14,1289-1293.
  29. Transition metal complexes of 20-22 membered octaazamacrocycles: synthesis and characterization. Shakir, M., Saji P. Varkey and Nasman, O.S.M.; Polyhedron, 1995,14,1283-1288.
  30. Synthesis of novel 16-18 membered tetraazamacrocycles and their transition metal complexes. Shakir, M. and Saji P. Varkey; Indian J. Chem., 1995,34A,355-359.
  31. A new synthetic approach for the preparation of tetraazamacrocycles and their transition metal complexes. Shakir, M. and Saji P. Varkey; Polyhedron, 1995,14,1117-1127.
  32. Synthesis and characterization of adducts of dichlorosulphato bis(1,3-propylenediamine) metal(II)with dialkyl tin dichlorides. Shakir, M., Hameed, P. S., Firdaus, F. and Saji P. Varkey; Transition Met. Chem.,1995,20,142-143.  
  33. Synthesis and characterization of organotin (IV) chlorosulphates. Li2[R2Sn(SO3Cl)4], Ba[R2Sn(SO3Cl)4] and Sn[R2Sn(SO3Cl)4](R= CH3, C2H5, C3H7, C4H9). Shakir, M., Hameed, P.S., Firdaus, F. and Saji P. Varkey; Polyhedron, 1995,13,2953-2956.
  34. Synthesis and characterization of 5,12-dioxo-7,14-dimethyl-1,4,8,11-tetraazacyclotetradeca-1,8-diene and its metal complexeswith Cr(II), Mn(II), Fe(II), Ni(II), Cu(II) and Zn(II) metal ions. Shakir, M., Saji P. Varkey and Khan, T. A.; Indian J. Chem., 1995,34A,72-75.
  35. Synthesis and characterization of the complexes of diamines with transition metal bis(chlorosulphates). M(SO3Cl)2.[M= Cr, Mn, Fe, Co, Ni, Cu]. Shakir, M., Hameed, P.S., Firdaus, F. and Saji P. Varkey; Synth. React. Inorg. Met. Org. Chem., 1994,24(10),1733-1744.
  36. Synthesis and characterization of six coordinate dinuclear 20-24 membered hexaaza macrocyclic complexes of nickel(II), copper(II) and zinc(II) with tetraamide ligand. Shakir, M. and Saji P. Varkey; Transition Met. Chem.,1994,19,606-610.
  37. Template synthesis of Fe(II), Co(II), Cu(II) and Zn(II) complexes of diamidediimine macrocycles. Shakir, M., Saji P. Varkey, Firdaus, F and Hameed P.S.; Polyhedron, 1994,13,2319-2325.
  38. Binuclear transition metal complexes of Schiff base macrocycles containing the furanyl moity. Shakir, M., Saji P. Varkey and Kumar, D.; Synth. React. Inorg. Met. Org. Chem.,1994,24(6),941-952.
  39. Synthesis and structural studies of binuclear transition metal complexes of diamidediimne hexaazmacrocycles. Shakir, M., Saji P. Varkey and Hameed, P.S.; Polyhedron,1994,13,1355-1361.
  40. Synthesis and characterization of binuclear transition metal macrocyclic complexes of 23,24-dioxo-3,7,14,18-tetraazacycloeicosa-1,2,7,9,11,13,18,20-octaene. Shakir, M. and Saji P. Varkey; Proc. Nat. Acad. Sci. India, II, 1994,64A,183-188.
  41. Synthesis and structural characterization of cobalt(II), nickel(II) and copper(II) complexes of 18- membered mixed donor macrocycles. Shakir, M. and Saji P. Varkey; Polyhedron,1994,13,791-797.
  42. Synthesis and characterization of Cr(II), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II)andCd(II) complexes of N,N'-diphenyl hydrazine and their triphenylphosphene derivatives.Shakir, M., Saji P. Varkey and Kumar, D.; Indian J. Chem.,1994,33A,426-428.
  43. Divalent cobalt, nickel,copper and zinc complexes of tetraazamacrocycles bearing polyamide group: Synthesis and characterization. Shakir, M., Saji P. Varkey and Hameed P.S.; Polyhedron, 1993,12,2775-2780.
  44. Synthesis and characterization of cobalt(II), nickel(II) and copper(II) complexes of dithiadiaza macrocycles. Shakir, M., Saji P. Varkey and Hameed P.S.; J. Chem. Res.(S),1993,11,442-443.
  45. Synthesis and characterization of cobalt(II), nickel(II) and copper(II) complexes of dithiadiaza macrocycles. Shakir, M., Saji P. Varkey and Hameed P.S.; J. Chem. Res.(M),1993,11,2964-2985.
  46. 3,4-dicyano-5-aminopyrazole complexes of anhydrous divalent transition metal chlorides and thierTriphenylphosphine derivatives. Shakir, M., Saji P. Varkey and Kumar, D.; Transition Met. Chem., 1993,18,107-109.
  47. 3-Mercapto-1,2-propanediol and its 1-methoxy and 1-ethoxy derivatives, SCH2CH(CH)CH2OR"(R= H, CH3, C2H5), as uninegative bidentate bridging ligands: Synthesis and characterization of dimeric complexes with cobalt, copper and silver. Shakir, M., Kumar, D. and Saji P. Varkey ; Polyhedron, 1992,11,2831-2836.

    48. PUBLISHED CONTRIBUTIONS TO NATIONAL & INTERNATIONAL CONFERENCES
  48. Ratnasamy, P., Jacob, C. R. and Saji P. Varkey (1998): Zeolite encapsulated copper(X2 salen ) complexes. Synthesis and characterization. Scientific bases for the preparation of heterogeneous catalysts, Belgium, 1998.
  49. Landau, M, Dorit, Saji P. Varkey, Valentine, T and Herskowitz M(1998): Fundamental and applied aspects of nanocrystalline zeolite and MCM-supported catalysts. Proceedings of the IInd international Conference on interaction of industrial and fundamental research in catalysis held during may 27-28 in Blechner Center, Ben-Gurion University of the Negev, Beer Sheva, Israel, pp-14.
  50. Ratnasamy, P. Jacob, C. R. and Saji P.Varkey, S. P.(1998): Zeolite encapsulated copper(X2 salen) complexes as selective oxidation catalysts. First Indo-Pacefic Catalysis Association at Cape Town, South Africa, January, 1998.
  51. Saji P. Varkey and Shakir, M.(1996): 3,4-Dicyano-5-aminopyrazole complexes of Co(I), Cu(I) and Ag(I). Proceeding of the First International Conference on Molecular Association, Aligarh, India,1996, p-59
  52. Shakir, M., Mohammed, A. K., Nasman, O. S. M. and Saji P. Varkey(1994): Synthesis and characterization of heterobimetallic 18- membered macrocyclic complexes. Proceedings of the 31st Annual Convention of Indian Chemical Society at Varanasi, India,1994, OP-67
  53. Shakir, M., Saji P. Varkey and Mohammed, A. K.(1994): Metal ion controlled synthesis of 20-24 membered hexaaza macrocyclic complexes. Proceedings of the 31st Annual Convention of Indian Chemical Society at Varanasi, India,1994, OP-68
  54. Shakir, M., Firdaus, F., Hammed, P. S. and Saji P. Varkey(1994): Synthesis and characterization of adducts of chlorosulphatobis(1,3-propylenediamine)metal(II), with dialkyl tin dichlorides. Proceedings of the 13th Annual Conference of Indian Council of Chemists at Jammu, India, October 1994, IO-19
  55. Shakir, M., Saji P. Varkey, Nasman, O. S. M. and Mohammed, A. K.(1994): Synthesis and characterization of diamidediimine tetraazamacrocyclic ligands and their metal ion recognition studies: Proceedings of the 13th Annual Conference of Indian Council of Chemists at Jammu, India, October 1994, IO-21
  56. Shakir, M. , Mhammed, A. K., Nasman, O. S. M. and Saji P. Varkey(1994): Template synthesis of binuclear octaazamacrcyclic complexes of Co(II), Ni(II), Cu(II) and Zn(II). Proceedings of the 13th Annual Conference of Indian Council of Chemists at Jammu, India, 1994, IO-20
  57. Shakir, M., Saji P. Varkey, Hammed P. S. and F. Firdaus(1993): Design, synthesis and spectroscopic and structural characterization of macrocyclic complexes of mixed donor sites: Proceedings of the 81st Indian Science Congress Association at Jaipur, India, 1993, 67
  58. Shakir, M., Saji P. Varkey and Mohammed, A. K.(1994): Metal ion controlled synthesis of 20-24 membered hexaaza macrocyclic complexes. Proceedings of the 31st Annual Convention of Indian Chemical Society at Varanasi, India,1994, OP-68
  59. Shakir, M., Firdaus, F., Hammed, P. S. and Saji P. Varkey(1994): Synthesis and characterization of adducts of chlorosulphatobis(1,3-propylenediamine)metal(II), with dialkyl tin dichlorides. Proceedings of the 13th Annual Conference of Indian Council of Chemists at Jammu, India, October 1994, IO-19
  60. Shakir, M., Saji P. Varkey, Nasman, O. S. M. and Mohammed, A. K.(1994): Synthesis and characterization of diamidediimine tetraazamacrocyclic ligands and their metal ion recognition studies: Proceedings of the 13th Annual Conference of Indian Council of Chemists at Jammu, India, October 1994, IO-21
  61. Shakir, M. , Mhammed, A. K., Nasman, O. S. M. and Saji P. Varkey(1994): Template synthesis of binuclear octaazamacrcyclic complexes of Co(II), Ni(II), Cu(II) and Zn(II). Proceedings of the 13th Annual Conference of Indian Council of Chemists at Jammu, India, 1994, IO-20
  62. Shakir, M., Saji P. Varkey, Hammed P. S. and F. Firdaus(1993): Design, synthesis and spectroscopic and structural characterization of macrocyclic complexes of mixed donor sites: Proceedings of the 81st Indian Science Congress Association at Jaipur, India, 1993, 67
  63. Shakir, M., Saji P. Varkey and Firdaus, F.(1993): Nitrogen, oxygen and sulfur donor macrocyclic metal complexes: Synthesis and characterization: Proceedings of the 30th Annual Convention of Chemists at Culcutta, India, 1993, OP -8
  64. Shakir, M., Saji P. Varkey and Kumar,D.(1992): Coordination behaviour of 3,4-dicyano-5-aminopyrazole towards anhydrous transition metal chlorides and their triphenylphosphine derivatives: Proceedings of the 29th Annual Convention of Chemists at Rewa, India, 1992, OP-63
  65. Shakir, M., Saji P.Varkey and Firdaus, F. (1992): Synthesis and physico chemical studies on dimeric complexes of 3-mercapto-1,2-propanediol and its methyl derivatives with Co(I), Cu(I) and Ag(I) ions. Proceedings, International symbosium on molecules to meterials at Bhubaneswar, India, 1992,p57
  66. Shakir, M. , Kumar, D. and Saji P. Varkey.(1991): Complexes of N,N’-diphenylhydrazene with transition metal precursors, M(PPh3)2Cl2 , M = Co(I), Ni(II), Cu(II), Cu(I), Zn(II), Cd(II), Hg(II). Proceedings of the 10th Annual Conference of Indian Council of Chemists at Goa, India, October 1978,IP-40

    67. LIST OF PATENTS FILED
  67. An improved process for the oxidation of para xylene. Saji P. Varkey, Ratnasamy, C. and Gopinathan, S. (1997): (India, Patent Ref. No. NF-155/97); Filed for US and European Patents (1998)
  68. An improved process for the oxidation of cyclohexane to adipic acid Saji P. Varkey, Ratnasamy, C. and Gopinathan, S. (1997): (India, Patent Ref. No. NF-101/97); Applied for US and European Patents (1997).
  69. A process for the simultaneous production of styrene oxide and benzaldehyde. Saji P. Varkey, Ratnasamy, C. and Gopinathan, S. (1997):(India, Patent Ref. No. NF-15/97).
  70. A process for the oxidation of methane to methanol and formaldehyde. Saji P. Varkey, Ratnasamy, C. and Gopinathan, S. (1997):(India, October, 1997 ).