Francis D'Souza
University of Houston
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Featured researches published by Francis D'Souza.
NLM | 2010
Eranda Maligaspe; Tatu Kumpulainen; Navaneetha K. Subbaiyan; Melvin E. Zandler; Helge Lemmetyinen; Nikolai V. Tkachenko; Francis D'Souza
Efficient electronic energy transfer (EET) in the newly synthesized dyads comprised of zinc porphyrin covalently linked to one, two or four numbers of boron dipyrrin (BDP) entities is investigated. Both steady-state and time-resolved emission as well as transient absorption studies revealed occurrence of efficient singlet-singlet energy transfer from BDP to zinc porphyrin with the time scale ranging between 28 and 48 ps. A decrease in time constants for energy transfer with increasing the number of BDP units is observed revealing better antenna effect of dyads bearing higher number of boron dipyrrin entities. Further, supramolecular triads to mimic the antenna-reaction center functionality of photosynthetic reaction center have been successfully constructed by coordinating fulleropyrrolidine appended with an imidazole ligand to the zinc porphyrin. The structural integrity of the supramolecular triads was arrived by optical, computational and electrochemical studies. Free energy calculations revealed possibility of photoinduced electron transfer from singlet excited zinc porphyrin to fullerene, and the preliminary transient absorption studies involving pump-probe technique are supportive of occurrence of electron transfer from (1)ZnP* to fullerene in the supramolecular triads.
NLM | 2009
Francis D'Souza; Ganesh M. Venukadasula; Ken-ichi Yamanaka; Navaneetha K. Subbaiyan; Melvin E. Zandler; Osamu Ito
Control over the occurrence of through-bond electron transfer in self-assembled donor-acceptor conjugates is often difficult, since through-space electron transfer also competes due to the flexible nature of the spacer used to link the entities. In the present study, we have constructed a self-assembled donor-acceptor conjugate held solely by complementary hydrogen bonding and established through-bond electron transfer. The protocol used here is a Hamilton type hydrogen bonding motif involving self-assembly of a carboxylic acid functionalized porphyrin and 2-aminopyridine functionalized fullerene. Owing to the presence of two-point hydrogen bonds, the structure of the dyad is free from rotation with a donor-acceptor distance positioned appropriately to justify the through-bond electron transfer. Detailed spectral, computational and photochemical studies reveal efficient photoinduced charge separation and slow charge recombination in the studied conjugate, thus, bringing out the fundamental advantages of the directional hydrogen-bonding in the construction of donor-acceptor conjugates based on biomimetic principles and their functional role in governing electron transfer events.
RADIATION PHYSICS: X International Proceedings on Radiation Physics | 2014
Mangal Dhoubhadel; Bibhudutta Rout; Wickramaarachchige J. Lakshantha; Sushanta K. Das; Francis D'Souza; Gary A. Glass; Floyd Del McDaniel
This paper investigates the synthesis of Ag NCs in Si(100) substrate by implanting multiple energies and fluences of Ag ions and subsequent thermal annealing.
Inorganica Chimica Acta | 1996
Roger Guilard; Mohamed Fahim; Florence Zaegel; Jean-Michel Barbe; Francis D'Souza; Ahmed Atmani; Victor A. Adamian; Karl M. Kadish
Abstract The synthesis and characterization of bimetallic and trimetallic porphyrins of the type [(P)SnRe(CO) 5 ]BF 4 and [{(P)Sn} 2 Re(CO) 4 ]BF 4 are reported where P is the dianion of tetra- p -tolyporphyrin (TpTP) or tetra- m -tolyporphyrin (TmTP). These metal-metal bonded complexes were synthesized by reaction of Re 2 (CO) 10 with the corresponding (P)SnCl 2 derivatives in 1,2-dichlorobenzene followed by a reaction with NaBF 4 or TBABF 4 in toluene to give the BF − 4 salt. Each compound was characterized by a variety of spectroscopic and electrochemical techniques while the structures were assigned on the basis of FAB mass spectral data and by comparison of their physicochemical properties with data for related metalue5f8metal bonded porphyrins previously synthesized in our laboratories. Each [(P)SnRe(CO) 5 ]BF 4 complex undergoes two reversible one-electron reductions at the porphyrin π-ring system while each [{(P)Sn} 2 Re(CO) 4 ]BF 4 derivatives exhibits four reversible reductions in accordance with the presence of two Sn porphyrin units having interacting redox centers. These reductions also occur at the conjugated macrocycle. The first oxidation of each compound is irreversible and is associated with a cleavage of the tinue5f8rhenium bond.
Inorganic Chemistry | 1999
Karl M. Kadish; Eric Van Caemelbecke; Francis D'Souza; Min Lin; Daniel J. Nurco; Craig J. Medforth; Timothy P. Forsyth; Bénédicte Krattinger; Kevin M. Smith; Shunichi Fukuzumi; and Ikuo Nakanishi; John A. Shelnutt
Inorganic Chemistry | 1993
L. Keith Woo; J. Alan Hays; Victor G. Young; Catherine L. Day; Cecile Caron; Francis D'Souza; Karl M. Kadish
Archive | 2011
Francis D'Souza; Karl M. Kadish
Archive | 2010
Francis D'Souza; Osamu Ito
Archive | 2014
Francis D'Souza; Karl M. Kadish
Organic Nanomaterials: Synthesis, Characterization, and Device Applications | 2013
Francis D'Souza; Atula S. D. Sandanayaka; Osamu Ito