Metalloporphyrins | An-Najah Staff

The Catalytic Activity of Poly(Siloxane)- Supported ‎Metalloporphyrins in Olefin Oxidation Reactions: The ‎Effect of the Support on the Catalytic Activity and ‎Selectivity

Wed, 2014-04-02 08:52 — Dr. Waheed J. Jondi

Journal Title, Volume, Page:

Journal of Molecular Catalysis A: Chemical Volume 113, Issues 1–2, Pages 35–44

Year of Publication:

1996

Link:

http://www.sciencedirect.com/science/article/pii/S1381116996000556

Authors:

Waheed Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Hikmat S. Hilal

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Shukri Khalaf

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Afaq Keilani

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad Suleiman

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Mohammad Suleiman

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

A.F. Schreiner

Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA

Preferred Abstract (Original):

Supported tetra(-4-pyridyl)porphyrinato-manganese(III) [Mn^III(TPyP)]⁺ and -tin(IV) [Sn^IV(TPyP)]²⁺ have been prepared. The solid support was iodonated poly(siloxane) surface prepared by condensation reactions of (EtO)₄Si with (MeO)₃Si(CH₂)₃I. The supported metalloporphyrins were employed as catalysts for the oxidation reactions of 1-octene and of cyclohexene. NaBH₄ was used to reduce [Mn^III(TPyP)]⁺ and [Sn^IV(TPyP)]²⁺ back to their catalytically active Mn^II and Sn^II forms, respectively. Contrary to their homogeneous counterparts, both of the supported metalloporphyrins catalysed the cyclohexene oxidation reaction to yield only 2-cyclohexen-1-one with no other products over a reaction time of 10 h. In addition to cyclohexene oxidation, the supported [Mn^III(TPyP)]⁺ catalysed 1-octene oxidation as well, whereas the supported [Sn^IV(TPyP)]²⁺ was inactive for the oxidation of 1-octene.

see te full file here

The Catalytic Activity of Poly(Siloxane)-Supported Metalloporphyrins in Olefin Oxidation ‎Reactions: The Effect of The Support on the Catalytic Activity and Selectivity

Mon, 2014-03-24 14:44 — Shukri Mohammed Khalaf

Journal Title, Volume, Page:

Journal of Molecular Catalysis A: Chemical, Volume 113, Number 1, pp. 35-44(10)

Year of Publication:

1996

Link:

http://www.ingentaconnect.com/content/els/13811169/1996/00000113/00000001/art000...

Authors:

Khalaf, S.

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Jondi, W.

Hilal, H.S.

Keilani, A.

Suleiman, M.

Schreiner, A.F.

Preferred Abstract (Original):

Supported tetra(-4-pyridyl)porphyrinato-manganese(III)[Mn^III(TPyP)]⁺ and -tin(IV)[Sn^IV(TPyP)]²⁺ have been prepared. The solid support was iodonated poly(siloxane) surface prepared by condensation reactions of (EtO)₄Si with (MeO)₃Si(CH₂)₃I. The supported metalloporphyrins were employed as catalysts for the oxidation reactions of l-octene and of cyclohexene. NaBH₄ was used to reduce [Mn^III(TPyP)]⁺ and [Sn^IV(TPyP)]²⁺ back to their catalytically active Mn^II and Sn^II forms, respectively. Contrary to their homogeneous counterparts, both of the supported metalloporphyrins catalysed the cyclohexene oxidation reaction to yield only 2-cyclohexen-1-one with no other products over a reaction time of 10 h. In addition to cyclohexene oxidation, the supported [Mn^III(TPyP)]⁺ catalysed l-octene oxidation as well, whereas the supported [Sn^IV(TPyP)]²⁺ was inactive for the oxidation of l-octene.

see the full file here

The catalytic activity of poly(siloxane)-supported metalloporphyrins in olefin oxidation reactions: the effect of the support on the catalytic activity and selectivity

Wed, 2010-04-21 14:32 — Hikmat S. Hilal, D.Sc.

Journal Title, Volume, Page:

Journal of Molecular Catalysis A: Chemical Volume 113, Issues 1-2, 25 November 1996, Pages 35-44

Year of Publication:

1996

Link:

http://www.sciencedirect.com/science/article/pii/S1381116996000556

Authors:

Hikmat S. Hilal

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

Current Affiliation:

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

[email protected]

Waheed Jondi

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

Shukri Khalaf

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

Afaq Keilani

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

Mohammad Suleiman

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

A. F. Schreiner

Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA

Preferred Abstract (Original):

Supported tetra(-4-pyridyl)porphyrinato-manganese(III) [MnIII(TPyP)]+ and -tin(IV) [SnIV(TPyP)]2+ have been prepared. The solid support was iodonated poly(siloxane) surface prepared by condensation reactions of (EtO)4Si with (MeO)3Si(CH2)3I. The supported metalloporphyrins were employed as catalysts for the oxidation reactions of 1-octene and of cyclohexene. NaBH4 was used to reduce [MnIII(TPyP)]+ and [SnIV(TPyP)]2+ back to their catalytically active MnII and SnII forms, respectively. Contrary to their homogeneous counterparts, both of the supported metalloporphyrins catalysed the cyclohexene oxidation reaction to yield only 2-cyclohexen-1-one with no other products over a reaction time of 10 h. In addition to cyclohexene oxidation, the supported [MnIII(TPyP)]+ catalysed 1-octene oxidation as well, whereas the supported [SnIV(TPyP)]2+ was inactive for the oxidation of 1-octene.

Controlling Charge-Transfer Processes at Semiconductor/Liquid Junctions

Wed, 2010-04-21 14:32 — Hikmat S. Hilal, D.Sc.

Journal Title, Volume, Page:

Electrochimica Acta Volume 51, Issue 28, 15 September 2006, Pages 6487-6497

Year of Publication:

2006

Link:

http://www.sciencedirect.com/science/article/pii/S0013468606005044

Authors:

Hikmat S. Hilal

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

Current Affiliation:

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

[email protected]

John A. Turner

National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA

Preferred Abstract (Original):

The interfacial kinetics of charge transfer at n-GaAs/liquid junctions were controlled by anchoring positively charged species, such as tetra(-4-pyridyl)porphyrinatomanganese(III), with the semiconductor surface. Unlike earlier adsorption techniques, the charges have been chemically anchored to the semiconductor surface, in this work, via a ligand. The number of charges per site (attached molecule) ranged from +1 to +5. The positive charges shifted the band-edges towards more positive potential values. The degree of shift increased with surface charge density. In the dark, the flat band potential (measured by Mott–Schottky technique) and the onset potential were shifted by up to 300 mV depending on surface charge density. Relatively less of a shift was observed during illumination of the system. Other surface characteristics, such as conversion efficiency and photoluminescence intensity, have been enhanced. The basis for these shifts and their implications with respect to control of interfacial processes are discussed.