Fields Of Main Interest









1.         F. G. Herring, J. S. Hwang, W. C. Lin, and C. A. McDowell, "Electron Spin Resonance Spectrum and Electron­ic Structure of PO32‑  Radical in X‑Ray Irradi­ated Single Crystal of Ammonium Fluorophosphate",  J. Phys. Chem. 70, 2487 (1966).


2.         F. G. Herring, J. S. Hwang, W. C. Lin, and C. A. McDowell, "Electron Spin Resonance of X‑Ray Irradiated Polycrystalline and Single‑Crystal  Sodium  Hexa­fluoro­antimonate", J.  Phys. Chem. 71, 2086 (1967). 


3.         J. S. Hwang, "Pressure and Temperature Studies of Liquids by Electron Spin Resonance", Diss. Abstr Int. B, 33(1), 135 (1972).


4.         J. Hwang, D. Kivelson, and W. Plachy, "ESR Line Widths in Solution.  VI.  Variation with Pressure and Study of Function­al Dependence of Anisotropic Interaction Parame­ter, k*", J. Chem. Phys. 58, 1753 (1973).


5.         J. S. Hwang, R. P. Mason, L. P. Hwang, and J. H. Freed, "ESR Studies of Anisotropic Rotational Reorien­tation and Slow Tumbling in Liquid and Frozen  Media. III. Perdeute­rated 2,2,6,6-Tetramethyl‑4‑Piperidone N‑Oxide and an Analysis of Fluctuating Torques", J. Phys. Chem. 79, 489 (1975).


6.         J. S. Hwang,  K. V. S. Rao, and  J. H. Freed,  "An Electron Spin Resonance Study of the Pressure Depen­dence of Ordering and Spin Relaxation in a Liquid Crystalline Solvent", J. Phys. Chem. 80, 1490 (1976).


7.         K. V. S.  Rao, J. S. Hwang, and  J.  H. Freed, "Symme­try  of Orientational Order Fluctuations about the Nematic­‑Isotropic Transition:  An ESR Study", Phys. Rev. Lett. 37, 515 (1976).


8.         M.  Geoffroy, L. D. Kispert, and J. S. Hwang, "An ESR, ENDOR and ELDOR  Study of Tunneling Rotation of a Hindered Methyl Group  in X‑Irradiated 2,2,5‑Trime­thyl‑1,3‑Dioxane‑4,6‑Dione Crystals", J. Chem. Phys. 70, 4238 (1979).


9.         J.  S. Hwang, A. C. Dickinson, and L. D. Kispert, "ENDOR and ELDOR  Studies of  X‑Irradiated  Polycryst­alline Dipeptides, Myosin, and Actomyosin", J. Phys. Chem. 83, 3381 (1979).


10.       J. S. Hwang, B. Andersson, L. D. Kispert, and M. Geoffroy, "An EPR, ENDOR and ELDOR Study of X‑Ray Irradi­ated Phenacyl Chloride Single Crystals", Bull. Mag. Res. 2, 202 (1980).


11.       J. S. Hwang, H. C. Wang, B. Andersson, and L. D. Kispert, "An Electron Spin Double Resonance Study of X‑Ray Irradi­ated Phenacyl Chloride Single Crystals", J. Chem. Phys. 75, 3758 (1981).


12.       J. S. Hwang and C. P. Tsonis, "EPR Studies of the Thermal Polymerization of Phenylacetylene", Polymer 22, 1462 (1981).


13.       M. Geoffroy, H. C. Wang, L. D. Kispert, H. J. Sipe, Jr., and J. S. Hwang, "The Effect of Deuteration upon the Tunneling Rotation of a Hindered  Methyl Group in X‑Irradiated 2,2‑Dimethyl‑d6‑5‑Methyl‑1,3‑Dioxane‑4,6-­Dione Crystals:  An ENDOR Study", J. Chem. Phys. 75, 5963 (1981).


14.       M. Geoffroy, J. Hwang, and A. Llinares, "An ESR Study of X‑ Ray Irradiated Ph3AsF2 Single Crystal", J. Chem. Phys. 76, 5191 (1982).


15.       H. J. Sipe, Jr., L. D. Kispert, J. S. Hwang, and C. P. Tsonis, "Electron Paramagnetic Resonance Studies of Thermal­ly Produced Radicals in Phenylacetylene", J. Phys. Chem. 86, 4017 (1982).


16.       J. S. Hwang and C. P. Tsonis, "EPR Application to Poly­mers.  2.  Spin Probing of Poly(phenylacetylene)", Macromolecules 16, 736 (1983).


17.       A. S. W. Li and J. S. Hwang, "Determination of Intrin­sic Linewidth and Deuterium Isotropic Hyperfine Coupling Constant of PD‑Tempone in Jojoba Oil and Microemulsion:  An ESR Study", Arabian J. Sci. Eng. 9, 233 (1984).


18.       E. E. Khawaja, M. A. Khan, M. N. Khan, A. S. W. Li, and J. S. Hwang, "The Electrical Conductivity of Sodium‑­Cop­per‑Germanate Glasses", J. Mat. Sci. Lett. 3, 593 (1984).


19.       C. P. Tsonis and J. S. Hwang, "Catalytic Activity and Selec­tivity of Group VIB Metal Carbonyl Complexes in Dehydrohalo­genation Reactions", J. Mol. Catal. 26, 219 (1984).


20.       A. S. W. Li and J. S. Hwang, "Anisotropic Rotational Reorienta­tion of Perdeuterated 2,2,6,6‑Tetramethyl‑4­-Pip­eridone N‑Oxide in Jojoba Oil:  An ESR Lineshape Study", J. Phys. Chem. 89, 2556 (1985).


21.       E. E. Khawaja, F. Tegally, J. S. Hwang, A. S. W. Li, and A. A. Kutub, "Effect of Annealing on the Electri­cal and Optical Properties of V2O5‑GeO2 Glasses", J. Mat. Sci. 20, 3074 (1985).


22.       J. S.  Hwang, M. M. Saleem, and C. P. Tsonis, "EPR Applica­tion to  Polymers.  3. EPR Studies of Poly­(phenylacetylene) using  Different Nitroxide Spin Probes",  Macromolecules 18, 2051 (1985).


      23.       J. S. Hwang, P. Pollet, and M. M. Saleem, "ESR Line­shape of N‑(4‑n Butyl Benzilidine) 4‑Amino 2,2,6,6­‑Tetramethyl Piperidine 1‑Oxide (BBTMPO) in Toluene",  J. Chem. Phys. 84, 577 (1986).


24.       E. E. Khawaja, M. S. Hussain, M. A. Khan, and J. S. Hwang, "Spectroscopic, Electrical and EPR Studies of Binary Semi­conducting Oxide Glasses Containing 50 Mole % Vanadium Oxide (V2O5)", J. Mat. Sci. 21, 2812 (1986).


25.       C. P. Tsonis, S. A. Ali, and J. S. Hwang, "Studies on the Copolymer Composition of Sulphur Dioxide and Phenylacety­lene", Polymer 28, 2139 (1987).


26.              J. S. Hwang and M. S. Hussain, "EPR and Spectroscopic Studies of Configurational Changes in 1,4‑Diazacyclo­hep­tane Copper(II) Complexes", Transition Met. Chem. 12, 214 (1987).


27.              J. S. Hwang and C. P. Tsonis, "ESR Spin Radical Trapping in Dehydrohalogenation of Alkyl Halides Catalyzed by Molybdenum Hexacarbonyl", J. Molec. Catal. 44, 259 (1988).


28.              J. S. Hwang, W. A. Al‑Rashid, M. M. Saleem, "Aniso­tropic Rotational Reorientation of 2,2,6‑6‑Tetrame­thylpiperi­dine‑1‑Oxyl in Anion‑Exchange Resins:  An EPR Line Shape Study", J. Phys. Chem. 92, 3630 (1988).


29.              J. S. Hwang and W. A. Al‑Rashid, "An ESR Line Shape Study of Anisotropic Rotational Reorientation and Slow Tumbling in Liquid and Frozen Jojoba Oil", Spectrochi­mica Acta 44A, 1237 (1988).


30.              J. S. Hwang, W. A. Al‑Rashid, M. M. Saleem, "Aniso­tropic Rotational Reorientation of 2,2,6‑6‑Tetrame­thylpiperi­dine‑1‑Oxyl in Anion‑Exchange Resins:  An EPR Line Shape Study", J. Phys. Chem. 93, 1008 (1989).


31.              G. A. Oweimreen and J. S. Hwang, "The Nematic‑Iso­tropic Two‑Phase Region in Mixtures of Quasi‑Spherical Solutes in Alkylcyanobi­phenyls: An ESR Using Tempone as Probe", Liquid Crystals 5, 585 (1989). 


32.              A. Tari and J. S. Hwang, "Magnetization and ESR Studies of Gd(Ni1‑xRhx)5 Compounds", Physica Status Solidi B 157, 701 (1990). 


33.              J. S. Hwang and T. Ogawa, "ESR Studies of the Interac­tion of Propagating  Radicals  with  Diacetylenes", Polymer Bulletin 23, 239 (1990).


34.              J. S. Hwang and  S. J. Lyle,  "Ion  Pairs in  Macro­retic­ular Polystyrene  Resins.  Part 1. EPR Study Using an Anion Spin Label", J. Phys. Chem. 94, 8727 (1990). 


35.              J. S. Hwang, M. M. Saleem, and  C. P. Tsonis,  "EPR Applica­tion to Polymers IV.  The  Segmental Volume of Poly(phenyl­acetylene) Using Different  Nitroxide Spin Probes", Polymer, 32, 231 (1991). 


36.              J. S. Hwang, M. N. Siddiqui, and A. M. Bukhari, "Thermol­ysis of 7‑Isopropylidene‑2,3‑Diazabicyclo [2.2.1] Hept‑2‑ene in the Presence of Spin Trap", Tetrahedron Letters, 32, 3711 (1991). 


37.              G. Burillo, T. Ogawa, and  J. S. Hwang, "Studies on Diacetylenic Vinyl Compounds.  VI.  ESR Studies on the Polymerization of Diacetylene Containing Acrylate and Methacrylates", J. Polym. Sci. Polym. Chem., 30, 2159 (1992). 


38.              J. S. Hwang and S. J. Lyle, "Ion Pairs in Macroreti­cular Resins.  2.  EPR Study using Cation Spin­‑Labels", J. Phys. Chem., 96, 9079 (1992). 


39.              J. S. Hwang and M. H. Rahman, "Determination of the Anisotropy of Rotational Reorientation from EPR Line Width Data", Chem. Phys. Lett., 199, 286 (1992).  


40.              J. S. Hwang and S. J. Lyle, "Spin Labelling Studies of Cross-linked Polystyrene Resins", Proceedings of the 1st International Conference on Chemistry in Industry, Part II, pp. 1151-1166, (1992). 


41.              J. S. Hwang and C. P. Tsonis, "Radicals in the Synthe­sis of Sulphur Dioxide-Based Copoly­mers", J. Polym. Sci. Polym. Chem. 31, 1417 (1993). 


42.              A. Tari, V. Keith, and J. S. Hwang, "Magnetic Proper­ties of (Ho1-cGdc)Co2", Physica B 194-196, 251 (1994). 


43.              J. S. Hwang and C. P. Tsonis, "Spin Trapping in the Interaction between Acetylenic Hydro­carbons and Group VIB Metal Carbonyls", React. Kinet. Catal. Lett. 52, 347 (1994).  


44.              J. S. Hwang, M. O. H. Al-Turabi, and L. El-Sayed, "EPR and Spectro­scopic Studies of Bis(S-methyl-3-isopropyl­idene­hydrazinecarbodithioato)oxo-vanadium(IV) as Model Compound for Vanadium Bound to Nitrogen and Sulfur Heteroatoms", Energy and Fuels 8, 793 (1994). 


45.              J. S. Hwang, M. A. Morsy, and G. A. Oweimreen, "Non­mesomorp­hic Solute-Mesomorphic Solvent Interactions Studies:  I.  Visual and ESR Studies on Nitroxide Radicals in the Nematic and Isotropic Phases of 4-cyano-4'-pentylbiphenyl (5CB) Liquid Crystal­line Solvent",  J. Phys. Chem. 98, 9056 (1994). 


46.              G. A. Oweimreen, M. A. Morsy, and J. S. Hwang, "A Novel ESR Approach to Accurately Probe Phase Transition Temperatures in Liquid Crystalline Systems", Molec. Cryst. Liq. Cryst. 264, 2763 (1995). 


47.              J. S. Hwang and H. B. Balkhoyor, "ESR Studies of the Coupling of Translational and Reorientational Motion of Dichlorobis(h-Cyclopentadienyl)vanadium in Solution", J. Phys. Chem. 99, 8447 (1995). 


48.              G. A. Oweimreen, M. A. Morsy, and J. S. Hwang, "Phase Diagrams from Spin Probe Studies for Binary Mixtures of Non-mesomorphic Solutes in 5CB", Appl. Magn. Reson. 9, 61, (1995). 


49.              M. A. Morsy, G. A. Oweimreen, and J. S. Hwang, "Non­mesomorp­hic Solute-Mesomorphic Solvent Interactions Studies:  II.  ESR Studies on the Differ­ent Phases of 5CB, 6CB, 7CB, and 8CB Liquid Crystals using PD-Tempone and Tempo-Palmi­tate as Probes; Structural and Conforma­tion­al Effects",  J. Phys. Chem.  100, 8331 (1996). 


50.              R. R. Rakhimov, N. P. Benetis, A. Lund, J. S. Hwang, A. I. Prokofev, and Y. S. Lebedev, “Intramolecular and Reorientation Dynamics of bis(triphenylphosphine)-3,6-di-tert-butyl-4,5-dimethoxy-o-semiquinone Complex of Copper(I) in Viscous Media”, Chem. Phys. Lett. 255, 156 (1996). 


51.              M. A. Morsy, J. S. Hwang, and G. A. Oweimreen, "Non­mesomorp­hic Solute-Mesomorphic Solvent Interactions Studies:  III.  A Unified Approach to Probe Liquid Crystalline Order by ESR",  J. Phys. Chem B  101, 2120 (1997).  


52.              Y. T. Al-Janabi and J. S. Hwang,  " EPR Study of the Anisotropic Interaction Parameter of Dichlorobis(h-Cyclopentadienyl)vanadium in Chloroform”,  Arab. J. Sci. Eng. 23 (1A), 23 (1998). 


53.              R. S. Prosser, J. S. Hwang, and R. R. Vold, "Characterization of a Magnetically Oriented Phospholipid/Lanthanide Bilayer with a Positive Order Parameter - A Deuterium Solid State NMR Study”,  Biophys. J74, 2405 (1998).  


54.              J. S. Hwang, M. O. H. Al-Turabi, L. El-Sayed, and H. A. M. Al-Gwidi, “EPR and Spectroscopic Studies of S-Methyl-N-salicylidenehydrazinecarbothioato-phenanthrolineoxivanadium(IV) Bound to Nitrogen and Sulfur Heteroatoms”, Energy & Fuels 14, 179 (2000).  (Published on Web 12/29/1999). 


55.              J. S. Hwang  and Y. T. Al-Janabi, “Frequency Dependent Study of the Correlation Functions in EPR Spectroscopy – the Cole-Davidson Approach.  1.  Perdeuterated 2,2,6,6-Tetramethyl-4-Piperidone N-Oxide in Toluene”, Spectrochimica Acta (A) 56, 273 (2000). 


56.              S. M. Sultan, M. O. H. Al-Turabi, and J. S. Hwang, “Electron Spin Resonance for Quantitative Assay of Chlorpromazine in Drug Formulations by Oxidation with Cerium(IV) in Sulfuric Acid Media”, Talanta 51 , 327 (2000).  


57.              G. A. Oweimreen and J. S. Hwang, “Evidence of Tilt Angle in an 8CB-10CB Mixture”, Chem. Phys. Lett. 334 , 83 (2001).


58.              J. S. Hwang and G. A. Oweimreen: Anomalous Viscosity Behavior of a Bicelle System with Various Molar Ratios of Short- and Long-Chain Phospholipids, Arabian Journal of Science and Engineering, 28 (1A), 43 (2003).


59.              J. S. Hwang and G. A. Oweimreen “The Solubility Product of PbCl2 from Electrochemical Measurements”,  J. Chem. Ed. 80 (9),  1051 (2003).  


60.              R. R. Rakhimov, T. H. Hawkins, J. S. Hwang, A. I. Prokof’ev, and A. I. Aleksandrov, “Structure and Dynamics of Bis(triphenylphosphine)-3,6-di-tert-butyl-o-semiquinone Radical Anion Complexes of Ag+ and Cu+”, J. Physical Chemistry A, 107(33),  6345 (2003).


61.              R. R. Rakhimov, E. M. Jackson, J. S. Hwang, A. I. Prokof’ev, I. A. Aleksandrov, A. Y. Karmilov, and A. I. Aleksandrov, “Mechanochemical Synthesis of Co, Ni, Fe Nanoparticlas in Polymer Matrices, J. Appl. Phys. 95 (11), 7133 (2004).


62.              R. R. Rakhimov, J. S. Hwang, A. I. Prokof’ev, I. A. Aleksandrov, A. N. Zelenetskii, and A. I. Aleksandrov, “Paramagnetic Properties of Covalently Linked Mixed Valence Chromium Complexes in Polymer”, J. Appl. Phys. 95 (11), 7342 (2004).  


63.              J. S. Hwang and G. A. Oweimreen, “Anisotropy of Rotation of Nitroxide Probes in Nematogenic Liquid Crystals”, Applied Magnetic Resonance 26(3), 387 (2004).


64.              G. A. Oweimreen and J. S. Hwang, “The Effect of N-(4-n-butyl benzilidine) 4-amino 2,2,6,6-tetramethyl Piperidine 1-oxide on the nematic-to-isotropic phase transition of 4-n-pentyl-4’-cyanobiphenyl”, Thermochimica Acta  421(1-2), 225 (2004).





1. SABIC Research Project No. SABIC/2000-13 entitled “The Effect of Lanthanide Ions on the Ordering in Phospholipid Bilayers” (Principal Investigator) with G. A. Oweimreen.


2. KFUPM funded research proposal CY/ESR/30 entitled “Electron Spin Relaxation in Liquids and Dynamics of Surface Adsorption”, (Approved Budget:  $ 1M).  (Principal Investigator).