Recent Publications


  1. R. P. Steer, Prospects for Efficient Solar Energy Upconversion Using Metalloporphyrins as Dual Absorber-Upconverters. RSC Dalton Transactions, 47, 8517-8525 (2018).
  2. R. P. Steer, Comment on “Metal–organic green dye: chemical and physical insight into a modified Zn-benzoporphyrin for dye-sensitized solar cells”. RSC Advances, 8, 17486-17489 (2018).
  3. A. L. Stevens, S. Novakovic, J. M. White, W. W. H. Wong, T. A. Smith, K. P. Ghiggino, M. F. Paige and R. P. Steer, Exciton Dynamics of Photoexcited Pendant Porphyrin Polymers in Solution and in Thin Films. Journal of Physical Chemistry, A, 122, 9605-9614 (2018).
  4. R.P. Steer, Electronic energy pooling in organic systems, a cross-disciplinary tutorial review. Canadian Journal of Chemistry, 95, 1025-1040 (2017).
  5. N. Rautela, N.K. Joshi, S. Novakovic, W.W.H. Wong, J.M. White, K.P. Ghiggino, M.F. Paige and R.P. Steer, Determinants of the efficiency of photon upconversion by triplet-triplet annihilation in the solid state: zinc porphyrin derivatives in PVA. Physical Chemistry Chemical Physics 19, 23471-23482 (2017).
  6. N.K. Joshi, A. Polgar, R.P. Steer and M.F. Paige, White light generation using Forster resonance energy transfer between 3-hydroxyquinoline and nile red. Photochemical and Photobiological Science, 15, 609-615 (2016).
  7. C.P. Ponce, H. Araghi, N.K. Joshi, R.P. Steer and M.F. Paige, Spectroscopic and structural studies of a surface active porphyrin in solution and in Langmuir-Blodgett films. Langmuir, 31, 13590-13599 (2015)
  8. A. J. Tilley, B. E. Robotham, R. P. Steer and K. P. Ghiggino, Sensitized non-coherent photon upconversion by intramolecular triplet-triplet annihilation in a diphenylanthracene pendant polymer, Chemical Physics Letters, 618, 198-202 (2015).
  9. Agnihotri and R. P. Steer, DFT and TD-DFT calculations of axially substituted tin porphyrins and an ethynyl-linked tin porphyrin dimer, Journal of Porphyrins and Phthalocyanines, 19, 610-621 (2015).
  10. N. Agnihotri and R. P. Steer, DFT and TD-DFT calculations of axially substituted tin porphyrins and an ethynyl-linked tin porphyrin dimer, Journal of Porphyrins and Phthalocyanines, 19, 610-621 (2015).
  11. N. K. Giri, A. Banerjee, R. W. J. Scott, M. F. Paige and R. P. Steer, Spectroscopic and photophysical study of the demetallation of a zinc porphyrin and the aggregation of its free base in a tetraalkylphosphonium ionic liquid, Physical Chemistry Chemical Physics, 16, 26252-26260 (2014).
  12. N. Agnihotri and R. P. Steer, TD-DFT calculations of the excited states of metalloporphyrins relevant to organic solar photovoltaic cells, Journal of Porphyrins and Phthalocyanines, 18, 475-492 (2014).
  13. R. P. Steer, Concerning correct and incorrect assignments of Soret (S2-S0) fluorescence in porphyrinoids: a short critical review, Photochemical and Photobiological Sciences, 13, 1117-1122 (2014).
  14. M. Ribas, R.P. Steer and R. Ruther, Photophysical properties of new bis-perylene dyads for potential upconversion use. Chemical Physics Letters, 605/606,126-130 (2014).
  15. K. Giri, C. P. Ponce, R. P. Steer and M. F. Paige, Homomolecular non-coherent photon upconversion by triplet-triplet annihilation using a zinc porphyrin on wide bandgap semiconductors, Chemical Physics Letters, 598, 17-22 (2013).
  16. K. P. Ghiggino, N. K. Giri, J. Hanrieder, J. D. Martell, J. Müller, M. F. Paige, B. Robotham, J. Szmytkowski and R. P. Steer, 2013. Photophysics of Soret-excited tin(IV) porphyrins in solution, Journal of Physical Chemistry A, 117, 7833-7840 (2013).
  17. S.K. Sugunan, C. Greenwald, M.F. Paige and R.P. Steer, Efficiency of noncoherent photon upconversion by triplet–triplet annihilation: the C60 plus anthanthrene system and the importance of tuning the triplet energies, Journal of Physical Chemistry A, 117, 5419-5427 (2013).
  18. C.P. Ponce, R.P. Steer and M.F. Paige, Photophysics and halide quenching of a cationic metalloporphyrin in water. Photochemical and Photobiological Sciences, 12, 1079-1085 (2013).
  19. M. Motyka, R.P. Steer, C.C. Williams, S. Lee and K.P. Ghiggino, Concerning the dual emission of porphyrazines employed in biomedical imaging. Photochemical and Photobiological Sciences, 12, 1086-1090 (2013).
  20. P.D. Harvey, F. Brégier, S.M. Aly, J. Szmytkowski, M.F. Paige and R.P. Steer, Dendron to central core S1-S1 and S2-Sn (n>1) energy transfers in artificial special pairs containing dendrimers with limited numbers of conformations, Chemistry: A European Journal, 19, 4352-4368 (2013).
  21. S.K. Sugunan, B. Robotham, R.P Sloan, J. Szmytkowski, K.P. Ghiggino, M.F. Paige and R.P. Steer, Photophysics of untethered ZnTPP-fullerene complexes in solution. Journal of Physical Chemistry A, 115, 12217-12227 (2011).
  22. S.K. Sugunan, M.F. Paige and R.P. Steer, Determination of oxygen permeabilities in thin polymer films using quenching of upconverted fluorescence in porphyrins. Canadian Journal of Chemistry, 89, 195-202 (2011).
  23. J.A. O’Brien, Y. Lu, E.N. Hooley, K.P. Ghiggino, R.P. Steer and M.F. Paige, Aggregation of zinc tetraphenylporphyrin characterized by ensemble and single-molecule fluorescence spectroscopy. Canadian Journal of Chemistry, 89, 122-129 (2011).
  24. J. Szmytkowski, S.M.K. Brunet, U. Tripathy, J.A. O’Brien, M.F. Paige and R.P. Steer, Photophysics and halide quenching of Soret-excited ZnTPPS4- in aqueous media. Chemical Physics Letters, 501, 278-282 (2011).
  25. S. Hirayama and R.P. Steer, Understanding the theory and practice of molecular spectroscopy: the effects of spectral bandwidth. Journal of Chemical Education, 87, 1344-1347 (2011).
  26. M. Maiti and R.P. Steer, Is Soret-excited ZnTPP quenched by electron transfer in chlorinated solvents? Chemical Physics Letters, 482, 254-258 (2009).
  27. M. Maiti, B.R. Danger and R.P. Steer, Photophysics of Soret-excited tetrapyrroles in solution. IV. Radiationless decay and triplet-triplet annihilation investigated using tetraphenylporphinato Sn(IV). Journal of Physical Chemistry A, 113, 11318-11326 (2009)
  28. .S. Sugunan, U. Tripathy, S. Brunet, M.F. Paige and R.P. Steer, Mechanisms of low power non-coherent photon upconversion in metalloporphyrin-organic blue emitter systems in solution. Journal of Physical Chemistry A, 113, 8548-8556 (2009).
  29. J.A. O’Brien, S. Rallabandi, U. Tripathy, M.F. Paige and R.P. Steer, Efficient S2-state production in ZnTPP-PMMA thin films by triplet-triplet annihilation: evidence of solute aggregation in photon upconversion systems. Chemical Physics Letters, 475, 220-222 (2009).
  30. D. Kowalska, X. Liu, U. Tripathy, A. Mahammed, Z. Gross, S. Hirayama and R.P. Steer, Ground- and excited-state dynamics of aluminum and gallium corroles. Inorganic Chemistry, 48, 2670-2676 (2009).
  31. X. Liu, U. Tripathy, A. Mahammed, Z. Gross and R.P. Steer, Photophysics of Soret-excited tetrapyrroles in solution. III. Al and Ga metallocorroles. Chemical Physics Letters, 459, 113-118( 2008).
  32. X. Liu, U. Tripathy, S.V. Bhosale, S.J. Langford and R.P. Steer, Photophysics of tetrapyrroles in solution. II. Effects of perdeuteration, substituent nature and position and macrocycle structure and conformation in zinc(II) porphyrins. Journal of Physical Chemistry A, 112, 8986-8998 (2008).
  33. U. Tripathy, X. Liu, D. Kowalska, S. Velate and R.P. Steer, Photophysics of Soret-excited tetrapyrroles in solution. I. MTPP, M = Mg, Zn, Cd. Journal of Physical Chemistry A, 112, 5824-5833(2008).
  34. D. Kowalska and R.P. Steer, Quenching of MgTPP and ZnTPP fluorescence by molecular oxygen. Journal of Photochemistry and Photobiology, A, 195,  223-227 (2008).
  35. S. Hirayama and R.P. Steer, 2007. Solvatochromism and barochromism revisited and revealed. Journal of Chemical Education, 84,  317-319 (2008).
  36. R.P. Steer, Comment on "Two pathways for photon upconversion in model organic compound systems", Journal of Applied Physics, 102, 076102-1-076102-3 (2007).
  37. A. Kitchin, S. Velate, M. Chen, K.P. Ghiggino, T.A. Smith and R.P. Steer, Photophysics of a dithioester RAFT polymerization agent and the acenaphthenyl model light-harvesting chromophore. Photochemical and Photobiological Sciences, 6,  853-856 (2007).
  38. M. Okamoto, S. Hirayama and R.P. Steer, A reinterpretation of the unusual barochromism of azulene. Canadian Journal of Chemistry, 85, 432-437.(2007).
  39. U. Tripathy and R.P. Steer, The photophysics of metalloporphyrins excited in their Soret and higher energy UV absorption bands. J. Porphyrins Phthalocyanines, 11, 228-243 (2007).
  40. A. Lukaszewicz, J. Karolczak, D. Kowalska, A. Maciejewski, M. Ziolek and R.P. Steer, Photophysical processes in electronic excited states of zinc tetraphenyl porphyrin accessed on one- and two-photon excitation in the Soret region.Chem. Phys., 331, 359-372 (2007).
  41. S. Velate, X. Liu and R.P. Steer, Does the radiationless relaxation of Soret-excited metalloporphyrins follow the energy gap law?Chem. Phys. Letters, 427, 295-299 (2006).
  42. X. Liu, E.K.Y. Yeow, S. Velate and R.P. Steer, Photophysics and spectroscopy of the higher electronic states of zinc metalloporphyrins: a theoretical and experimental study.Phys. Chem. Chem. Phys., 8 1298 - 1309 (2006).
  43. X. Yao, H.-B. Kraatz and R.P. Steer, Photophysics of pyrene-labelled compounds of biophysical interest.Photochem. Photobiol. Sci., 4, 191-199 (2005).
  44. G. Burdzinski, J. Kubicki, A. Maciejewski, R.P. Steer, S. Velate and E.K.L. Yeow, Photochemistry and Photophysics of Highly Excited Valence States of Polyatomic Molecules: Nonalternant Aromatics, Thioketones and Metallopophyrins in “Molecular and Supramolecular Photochemistry”, Vol. 14, V. Ramamurthy and K.S. Schantze, Eds., Taylor and Francis, New York, 2005, pages 1-36.
  45. E.K.L. Yeow, M. Ziolek, J. Karolczak, S.V. Shevyakov, A.E. Alsato, A. Maciejewski and R.P. Steer, Sequential, forward S2– S2 and back S1 – S1 (cyclic) energy transfer in a novel azulene-zinc porphyrin dyad. J. Phys. Chem., A, 108, 10980-10988 (2004). 
  46. J. Karolczak, D. Kowalska, A. Lukaszewicz, A. Maciejewski and R.P. Steer, Photophysical studies of porphyrins and metalloporphyrins: accurate measurements of fluorescence spectra, and fluorescence quantum yields for Soret band excitation of zinc tetraphenyl porphyrin.J. Phys. Chem., A, 108, 4570-4575 (2004).
  47. T.P. Lebold, E.K.L.Yeow and R.P. Steer, Fluorescence quenching of the S1and S2 states of zinc meso-tetrakis(4-sulfonatophenyl)porphyrin by halide ions. Photochem. Photobiol. Sci., 3, 160-165 (2003).
  48. E.K.L. Yeow and R.P. Steer, Energy transfer Involving higher electronic states:  a new direction for molecular logic gates.Chem. Phys. Letters, 377, 391-398 (2003).
  49. Y. Li and R.P. Steer, Kinetics of disaggregation of a non-covalent zinc tetraphenylporphyrin dimer in solution.Chem. Phys. Letters, 373, 94-99 (2003).
  50. E.K.L. Yeow and R.P. Steer, Dynamics of electronic energy transfer from the S2State of azulene to the S2 State of a zinc porphyrin. Phys. Chem. Chem. Phys., 5, 97-105 (2003).
  51. P. Aich, R.J.S. Skinner, S.D. Wettig, R.P. Steer and J.S. Lee, Long range molecular wire behaviour in a metal complex of DNA.J. Biomol. Struct. Dynam., 20, 93-98 (2002).
  52. A.M. Warsylewicz, K.J. Falk and R.P. Steer, Dynamics of the B excited state of thiophosgene. Chem. Phys. Letters, 352, 48-56 (2002).
  53. J. Kubicki, A. Maciejewski, M. Milewski, T. Wrozowa and R.P. Steer, The relaxation of electronically excited molecules: effects of alkyl substitution on the S2and T1 states of benzopyranthione in solution. Phys. Chem. Chem. Phys., 4, 173-179 (2002).
  54. L.C.T. Shoute, S. Hirayama and R.P. Steer, Vibronically selective intersystem crossing in van der Waals complexes of 9-cyanoanthracene with xenon.Chem. Phys. Letters, 338, 123-129 (2001).
  55. S.N. Smith and R.P. Steer, The photophysics of lissamine rhodamine B sulphonyl chloride in aqueous solution: implications for fluorescent protein-dye conjugates.J. Photochem. Photobiol. A, 139, 151-156  (2001).
  56. M. Sikorski, E. Sikorska, A. Koziolowa, R. Gonzalez-Moreno, J.L. Bourdelande, R.P. Steer and F. Wilkinson, Photophysical properties of lumichromes in water.J. Photochem. Photobiol. B, 60, 114-119 (2001).
  57. V.J. MacKenzie and R.P. Steer, Intermolecular interactions between tropolone and fluoro-methanes.Can. J. Phys., 79, 483-499 (2001). (Gerhard Herzberg Festschrift)
  58. L.C.T. Shoute, K.J. Falk and R.P. Steer, Spectroscopy and photophysics of 5-nitrotropolone in condensed media.Chem. Phys. Letters, 332, 359-366 (2000).
  59. J.C. Hlady and R.P. Steer, Electronic spectroscopy and structures of the van der Waals complexes ofa,w-dihaloalkanes with anthracene. Chem. Phys., 260, 249-260 (2000).
  60. X. Hou, S.R. Abrams, J.J. Balsevich, N. Irvine, T. Norstrom, M. Sikorski, H.K. Sinha and R.P. Steer, Synthesis and photophysical properties of fluorophore-labeled abscisic acid.Can. J. Chem., 78, 963-974 (2000).
  61. L.C.T. Shoute, V.J. MacKenzie, K.J. Falk, A. Warsylewicz and R.P. Steer, Spectroscopy and photophysics of tropolone in condensed media.Phys. Chem. Chem. Phys., 2, 1-9 (2000).