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Department of Chemistry
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Keith H. Pannell
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Ph.D.
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Professor
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Room : PSCI 307
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Tel : 915-747-5796
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Fax : 915-747-5748 or 915-747-5972
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Email:
kpannell@utep.edu
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University Degrees
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1962 B.S. Durham University, England.
1963 M.S. Durham
University, England.
1966 Ph.D. University
of Toronto, Canada.
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Research Interests
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Current research interests are
associated with the chemistry, biochemistry, materials potential, and
environmental fate of the group 14 elements, Si, Ge, Sn and Pb.
Selected publications since 1994 are listed.
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Ferrocenylene silane,
germane and stannane polymers and related ferrocenyl complexes
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This is a new class of high
molecular weight polymers that contain the electroactive
Fe unit as a direct part of the backbone. They are electrochromic,
act as variable index materials, and can be crystalline or amorphous elastomers depending upon the groups attached to the Si (Ge) atom. We are currently
studying them as chemical sensors and optical switching materials and have a
recent US patent concerning such uses.
 Nguyen, M.T.,
Diaz, A.F., Dement'ev,
V.V., Pannell, K. H. Electrochemical and Electrochromic
Properties of Poly(dialkylsilane)
Ferrocenylene Films. Chem Mater.
1994, 6, 952
Pannell, K. H., Dementiev,
V.V., Li Hong, Cervantes-Lee, F., Nguyen, M. T., Diaz, A.F.
(1,1'-Ferrocenediyl)ferrocenyl(methyl)silane, It's
thermally Ring-Opened Polymer, and Oligomer Models.
Organometallics
1994, 13, 3644
Kapoor, R.N.;
Crawford, G. M.; Mahmoud, J.; Dementiev,
V. V.; Nguyen, M-Y.; Diaz, A. F.; Pannell, K. H. Ferrocenylenegermane
Polymers and Copolymers.
Organometallics 1995, 14,
4944
K.H. Pannell,
V. V. Dementiev, A. F. Diaz. Transition
Metal-Containing Silicon-Based Polymers. The Polymeric Materials Encylopedia. Synthesis, Properties and Applications,
Ed. J. C. Salomone. CRC
Press, Inc. Boca
Raton, FLA. 1996, Vol 6, 4133
Enrique A. Reyes-García,
Francisco Cervantes-Lee, and K.H. Pannell
Synthesis, Spectroscopic and Substituent Dependent
Self-Assembling Structural Characterization of Ferrocenyl-Containing Silanediols, Fc(R)Si(OH)2, R = Me, CH2=CHCH2, n-Bu, t-Bu, Ph,
c-Hx Including Transformation to a Ferrocenyl Stannasiloxane, [OSiFc(n-Bu)O(t-Bu2)Sn]2. Organometallics 2000,
20, 4734
Madeli Castruita, F. Cervantes-Lee, J. S. Mahmoud,
Y. Zhang and K. H. Pannell. Synthesis and Characterization of New Germylferrocenyl, germylferrocenophane
and Polymeric Germyleneferrocenylene Systems.
J. Organomet. Chem.
2001, 637-639, 66
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Keith H. Pannell and Hemant K. Sharma.
Reinvestigation of the Rosenberg Synthesis of Silyleneferrocenylene
Polymers. Organometallics 1997,
16, 3077
Francisco Cervantes-Lee, Hemant Sharma, Keith H. Pannell, Agnes Derecskei-Kovacs, and Dennis S. Marynick
Confirmational Preferences of
1,3-diferrocenyl-1,1,3,3-tetramethyldisiloxane and Its Co-crystal with Ferrocene: The Role of Intra- and Intermolecular
Interactions. Organometallics
1998, 17, 3701
Keith H. Pannell, Hemant
K. Sharma, Francisco Cervantes-Lee and Jawad S. Mahmoud. Bis-(2,4,6-tri-isopropylphenyl) stannyleneferrocenophane and related ring-opened
products. Organometallics
1999, 18, 399
F. Cervantes-Lee, R. N. Kapoor, K. H. Pannell Ferrocenyl(dimethyl)chlorogermane. Zeit. Kristallogr. 2000,
215, 123
Keith H. Pannell*, Feng
Wang, Hemant K. Sharma and Francisco Cervantes-Lee.(Bis-ferrocenylsily)thiophenes and ferrocenylene(silylene)thiophene oligomers. Polyhedron
2000 , 19 ,291
H. Sharma, K.H.
Pannell, I. Ledoux, J. Zyss, A. Ceccanti, P. Zanello. Synthesis
, Spectroscopic, Electrochemical Characterization and Nonlinear Optical
Properties of Ferrocenyloligosilanes: FcSinMe2+n
(C6H5), n =1- 6, and FcSi2Me4{C6H4-X} (X = p-OMe,
p-NMe2, P-C1, m-CF3 , p-CH=C(CN)2) Organometallics
2000, 19, 770
Mikhail Yu. Antipina,
Ivan I. Vorontsova, Irene I. Dubovik,
Vladimir Papkov, Francisco Cervantes-Leeb and Keith H. Pannell*b .A Low Temperature Reversible
Phase Change for 1,1'-Bis-(ferrocenyldimethylsilyl)
ferrocenylene, [FcSiMe2]2(C5H4)2Fe an Oligomeric Model for Silyleneferrocenylene
Polymers. Can. J. Chem. 2000,
78, 1511
V.S. Papkov, M. V. Gerasimov, I. I. Dubovik, S. Sharma, V. V. Dementiev,
K. H.Pannell.
Crystalline Structure of some Poly(ferrocenyldialkylsilanes).
Macromolecules. 2000, 33, 7107
L. Espada, J. Robillard, M. Shadaram, K. H.
Pannell. Ferrocenylene Polymers as
Coatings for Tapered Fiber Optic Sensors. J.
Inorganic and Organometallic Polymers. 2000, 10, 169
Enrique A. Reyes-García,
Francisco Cervantes-Lee, and K.H. Pannell*
Synthesis, Spectroscopic and Substituent Dependent
Self-Assembling Structural Characterization of Ferrocenyl-Containing Silanediols, Fc(R)Si(OH)2, R = Me, CH2=CHCH2,
n-Bu, t-Bu, Ph, c-Hx Including Transformation to a
Ferrocenyl Stannasiloxane, [OSiFc(n-Bu)O(t-Bu2)Sn]2. Organometallics 2001, 20, 4734
Madeli Castruita, F. Cervantes-Lee, J. S. Mahmoud,
Y. Zhang and K. H. Pannell.
Synthesis and Characterization of New Germylferrocenyl,
germylferrocenophane and Polymeric Germyleneferrocenylene Systems.
J.
Organomet. Chem. 2001, 637-639, 664
Yongqiang
Zhang, Francisco Cervantes-Lee and Keith H. Pannell. Photochemistry of Bridged Disilyldiiron Complexes (SiMe2)[(h5-C5H4)Fe(CO)2SiMe2SiMe2R]2,
R = Me, Ph. J. Organomet.
Chem. 2001, 634, 102-108
Loren Espadaa,
Keith H. Pannell*a, Vladimir Papkovb, Larissa Leitesb, Sergey Bukalovb, Igor Suzdalevc, Masato Tanakad, and Teruyuki Hayashid. Iodine-Doped
Ferrocenylene-Silylene and -Germylene
Polymers. Organometallics 2002, 21, 3758
Zhang, Yongqiang;
Cervantes-Lee, Francisco; Pannell, Keith H. Hydrolysis of tert-Butyl
and Phenyl Ferrocenyldichlorogermanes:
Characterization of Di-tert-butyldiferrocenyldigermoxanediol
and 1,3,5-Triphenyl-1,3,5-triferrocenylcyclotrigermoxane. Organometallics 2003, 22, 510
Xiaoming Zhao,Hemant K. Sharma, Francisco
Cervantes-Lee,Keith H.Pannell*a,Gary J.Long, Ahmed M. Shahin. Bis-silyl substituted ferrocenylenes
,including dicyanovinyl electron-withdrawing
groups, as potential non-linear optical materials. Organometallics 2003, 686, 235-241
Antonio Villegas*, Roberto Olayo, Jorge Cervantes, Keith H. Pannell.
Photoreaction of poly(ferrocenylmethylsilane-co-phenylmethylsilane)
in solution. J. Organometallic.
Chemistry. 2003, 685, 196-201
X. Zhou, H. K. Sharma, F. Cervantes-Lee,
K. H. Pannell, G. J. Long, A. M. Shahin.
Bis-silyl substituted ferrocenylenes,
including dicyanovinyl electron-withdrawing groups,
as potential non-linear optical materials.
J.
Organomet. Chem. 2003 , 686 ,235
K. H. Pannell, H. K. Sharma, V.I. Imshennik, Yu.V. Maksimov, M. N. Il’ina, V. S. Papkov and I. P. Suzdalev.
Mixed-valence behavior in an iodine complex of poly(ferrocenylmethylphenylsilane).
Chem Mater. 2005, 17, 1844
Hemant K.
Sharma, Francisco Cervantes-Lee, Ionel Haiduc and Keith H. Pannell.
Unprecedented self-assembled cyclic hexamer of ferrocenyldimethylsilanaol, [FcSiMe2OH]6,
{Fc = (h5-C5H5)Fe(h5-C5H4)}.
J.
Appl. Organomet. Chem. 2005, 19, 437
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Transition metal oligosilyl complexes
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A unique range of new chemical reactions of
the Si-Si, Si-Ge, Ge-Ge, Sn-Ge etc., have permitted
us to develop catalytic systems for silylene (germylene, stannylene)
formation and oligosilyl isomerizations.
Pannell, K. H., Brun,
C., Sharma, H. K., Jones, K., and Sharma, S. Transition Metal Catalyzed Silylene Expulsion from, and Isomerization
of Oligosilanes. Organometallics
1994, 13, 1075
Sharma, H. and Pannell, K.H. Synthesis and Photochemistry of Germylsilyl,
Germylstanyl, and Stannylgermyl
Derivatives of the ( h5-C5H5)Fe(CO)2 (Fp) System. Organometallics
1994, 13, 4946
Zheng, Z.;
Sanchez, R. Pannell, K.H. Photochemistry of Indenyliron Dicarbonyl Disilanes involving Isomerization
Prior to Silylene Isomerization.
Organometallics 1995, 14, 2605
Sharma, H. K.; Pannell, K.H. Activation of the Si-Si
Bind by Transition Metal Complexes, Chem Rev. 1995, 95, 1351
Sharma, S.; Cervantes, J.; Mata-Mata, J.
L.; Brun, M-C.; Cervantes-Lee, F.; Pannell, K. H. Single
and Double Base Induced Migrations and Rearrangements in the System Fp(EMe2)nFp, E = Si, Ge, Sn.
Organometallics
1995, 14, 4269
Sharma, H.; Cervantes-Lee, F.; Pannell,
K. H. Catenated Group 14 Compounds. Synthesis,
Structural and Spectral Characterization, and Chemistry of the Chains
Me3CSiMe2GeMe2SnR3, R = Me, Ph.
Organometallics 1996,
15, 429
Keith H. Pannell, Hemant
K. Sharma, Ramesh N. Kapoor
and Francisco Cervantes-Lee. Isolation of a Reactive Ironsilyl(silylene) by Complexing to
Chromium Carbonyl: (h5-C5R5)Fe(CO)SiMe2(h6-C6H5Cr(CO)2)(m-SiMe2). J.
Am. Chem. Soc, 1997, 119, 9315
Sneh Sharma,
Noel Caballero, Hong Li, and Keith H. Pannell. The Si-Ge
Bond: Rearrangements, Migrations and Cleavages. Organometallics
1999, 18, 2855
Keith H. Pannell, Toshiaki Kobayashi,
Francisco Cervantes-Lee and Yongqiang Zhang alpha-
Versus beta-elimination photochemistry of oligosilyl-
and oligosilylmethyl-iron complexes: Photochemistry
of FpSiMe2SiMe2CH2Fp , Fp = (h5-C5H5)Fe(CO)2. Organometallics
2000, 19, 1
Sneh Sharma
and Keith H. Pannell. Syntheses and Photochemically Induced Rearrangements of Tetrasilyl- and Trisilylgermyl-Complexes
of Iron: (h5-C5R5)Fe(CO)2(SiMe2)3EMe2Ph, R = H, Me:
E = Ge, Si.
Organometallics 2000,
19, 1225
Yonqiang
Zhang, Francisco Cervantes, Keith H. Pannell. Stereospecific
Formation of 1,3-Disilacyclobutanes by Photochemical
Treatment of Bimetallic Precursors FpCH2SiR2SiR2CH2Fp.
J. Amer. Chem. Soc. 2000, 122, 8327
Zhang, Yongqiang;
Pannell, Keith H. Photochemistry of
the Three Possible Isomeric Cyclic Disilyliron
Complexes, FpSi2R5 (Si2R5 = 1,2,2-Trimethyldisilacyclohexyl,
(1-Methylsilacyclopentyl)dimethylsilyl, and 1-(Trimethylsilyl)silacyclopentyl,
Fp = (h5-C5H5)Fe(CO)2). Organometallics 2003,
22, 1766-1770
Zhang, Yongqiang;
Cervantes-Lee, Francisco; Pannell, Keith H..
Synthesis, Structure, and Photochemistry of Disilyl
Derivatives of the Fp (Fp
= (h5-C5H5)Fe(CO)2) System: FpMeSi(CH2)4SiMeFp
and FpPhMeSiSiMePhFp. Organometallics 2003,
22, 2517
Keith.H. Pannell*, Toshiaki Kobayashi, Francisco
Cervantes-Lee. Photochemical
transformation of a cyclic polysilane to a cyclic Carbosilane via (h5-C5H5)Fe(CO)2)CH2_/, FpCH2---, substitution J. Organometallic.
Chemistry. 2003, 189-195
Sharma, Hemant
K.; Cervantes-Lee, Francisco; Pannell, Keith H. Calhorda,
M. J.; Martinho, P.
Isolationof Ring-Opening of new
1-Sila-3-metallacyclobutanes (C5H4Fe)(CO)2CH2SiR2
Leading to A New Class of Organometallic Polymer. Chemtracts, 2004, 17,
195-199
H. K. Sharma, K. H. Pannell.
Silicon-Based Polymers Containing Transition Metals.
Silicon for the Chemical Industry, Norwegian University of Science and Technology, Trondheim, Norway, 2004,
251, 2660
Kapoor, Ramesh N.; Cervantes-Lee, Francisco; Campana,
Charles F.; Haltiwanger, Curtis; Abney, Kent;
Pannell, Keith H..
Synthesis, Structural and Spectroscopic Characterization, Catalytic
Properties, and Thermal Transformations of New Cyclic Di-
and Trisiloxanediolato Tantalum Complexes.
Inorg. Chem. 2006, 45, 2203-2208
Zhang, Yongqiang;
Pannell, Keith H.
Photochemistry of the Three Possible Isomeric Cyclic Disilyliron
Complexes, FpSi2R5 (Si2R5 = 1,2,2-Trimethyldisilacyclohexyl, (1-Methylsilacyclopentyl)dimethylsilyl, and 1-(Trimethylsilyl)silacyclopentyl, Fp =
(h5-C5H5)Fe(CO)2).
Organometallics
2003, 22, 1766-1770
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Catorcane Chemistry
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We are exploring the chemistry of
chains containing the linkage C-Si-Ge-Sn-Pb and
fractions thereof. Our studies in this arena involve the synthesis of new
silicon compounds, examination of their structures (single Xray structure) and chemistry.
29Si NMR, both
solution and solids, are important tools in this area of study. Párkányi, L., Kalman, A.,
Pannell, K.H. Sharma, H. New refinement of the Me3E---E′Ph3 (E = Ge, E′ = Sn; E = Sn, E′ = Ge) isomeric
compounds and the crystal structure of their solid solution . J.
Organometal. Chem. 1994, 484, 153
Párkányi,
L., Kalman, A., Sharma, S., Nolen, D., Pannell, K.
H. Close Packing and Isostructuralism of Analagous Ph3E-E'R3 Compounds ,
R = Me, E' = Si, Ge, Sn, and R = Ph E, E' = Si, Ge, Sn, Pb. Inorg. Chem. 1994, 33, 180
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Sharma, H. K., Villazana,
R., Cervantes-Lee, F., Párkányi, L., Pannell. K.H. Trimesityllead
Derivatives Including Structural Analysis of Monomeric
Mes3PbCl and Attempted Preparation of Mes3PbSnMe3. Phosphorus, Silicon and Related
Elements 1994, 87, 257
Stephen Whittaker, Keith H. Pannell.
Synthesis, Single Crystal X-ray Structural Characterization, and Reactivity
of a Hexaalkylplumbane, TsiMe2Pb-PbMe2Tsi, Tsi=(Me3Si)3C. Inorg. Chem. 1994, 33, 6406
Whittaker, S.; Brun,
M-C.; Cervantes-Lee, F.; Pannell, K. H. Synthesis, Structure and Chemistry
of the Decasilane Me3Si)3SiSiMe2SiMe2Si(SiMe3)3.
J. Organomet. Chem. 1995,
449, 247
Sharma, H.; Cervantes-Lee, F.;
Pannell, K. H. Catenated Group 14 Compounds.
Synthesis, Structural and Spectral Characterization, and Chemistry of the
Chains Me3CSiMe2GeMe2SnR3, R = Me, Ph. Organometallics 1996,
15, 429
Laszlo Parkányi,
Alajos Kálmán, Keith H.
Pannell, Francisco Cervantes-Lee, Ramesh N. Kapoor.Iso- and Homeostructuralism
of Analogous Ph4E and Ph3E-E'R3 Compounds (E=C, Si,
Ge, Sn, Pb and E' = Si, Ge, Sn; R=Me, and Ph):
Crystal structure of 1,1,1- Trimethyltriphenyldistannane.
Inorg. Chem. 1996, 35, 6622
W. Leigh, N. Totl, P. Apodaca, M. Castruita, K. H. Pannell.Photochemistry
of Group 14 1,1,1-trimethyl-2,2,2-triphenyl Dimetallanes;
Ph3EE'Me3, E = Ge, Si,
E' = Si,Ge. Organometallics
2000, 19, 3232
Yongqiang
Zhang and Keith H. Pannell .Formation of 1, 2, 4-trisilacyclopentanes by
Photolysis of FpCH2SiR2SiR2SiR2CH2Fp (Fp =
(h5-C5H5)Fe(CO)2). Organometallics 2002,
21, 503
Zhang, Yongqiang;
Cervantes-Lee, Francisco; Pannell, Keith H..
Synthesis and Photochemistry of the Three Isomeric Si2C2 Diiron Complexes FpCH2SiR2SiR2CH2Fp, FpCH2SiR2CH2SiR2Fp,
and FpSiMe2CH2CH2SiMe2Fp (Fp = (h5-C5H5)Fe(CO)2): Stereospecific
Formation of 1,3-Disilacyclobutanes. Organometallics 2002, 21, 5859-5867
F. Cervantes-Lee, H. K. Sharma, A. Haiduc, K. H. Pannell.
Silylgermylstannylmethanes.
J. Organomet.
Chem. 2003, 686, 379-382
Hemant K.
Sharma and Keith H. Pannell.
The substituent-dependent base-treatment chemistry
of (h5-C5H4)Fe(CO)2SiR2SiR2Cl: Formation of
1,2-disila-3-metallacyclobutanes, their ring-opened polymers, migrations
and substitutions.
J. Chem. Soc. Chem. Comun.
2004, 2556-7
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Organotin biocides
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We are
synthesizing new organotins and investigating their
biocidal potential via bacterial screening. The
program involves synthesis and characterization of tin compounds (via 119Sn
and single crystal Xray diffraction) and is
predicated upon the concept that mixed organotins
RR"SnCl2 will exhibit properties unique from those of the
homo-substituted analogs R2SnCl2 and R'2SnCl2.
F. Cervantes-Lee, H. K. Sharma, I. Haiduc, and K. H. Pannell . A
unique self-assembled tricyclic stannasiloxane
containing a planar Sn3SiO5 fused 6.4.4 tricyclic
ring system. J. Chem. Soc. Dalton, 1998, 1
Ioana
Pavel, Francisco Cervantes-Lee and Keith H. Pannell
Oxygen transfer reactions between tris-[(t-Bu)2SnO]3,
and Ph2GeCl2, Et2GeCl2 and PhBCl2.Phosphorus, Sulphur
and Silicon and the Related Elements, 1999, 150-1, 223
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Paula Apodaca,
Francisco Cervantes-Lee and Keith H. Pannell* Mixed Aryl-Alkyl Organotin Compounds. Main
Group Metal Chem. 2001, 24,
597
Ioana Pavel, Francisco Cervantes-Lee, Ionel
Haiduc and Keith H. Pannell Supramolecular
self-assembly using dative coordinate, secondary and hydrogen bonding in
solid [(Me3Sn)3(m-OH)2]+Br-. Inorg. Chem. Commun.
2001, 4, 530
Teresita Munguia, Ioana Pavel, Ramesh Kapoor, Francisco Cervantes-Lee, Keith H. Pannell.
Lewis Acidity of Group 14 Elements Toward Intramolecular
Sulphur in ortho-Arylthioanisoles.
Canadian
Journal of Chemistry, 2003, 81, 1388
Teresita Munguia, Francisco Cervantes-Lee, László
Párkányi, Keith H. Pannell.
Organometallic Tin-Sulfur Intramolecular
Interactions: An Overview of Current and Past Compounds and the Biological
Implications of Sn---S Interactions.
Chapter 30 in Advances in Chemistry, 917: Modern Aspects of Main Group
Chemistry, Lattman, M. and Kemp, R.A. Eds., American
Chemical Society, 2005, 421
Ramesh N. Kapoor, Paula Apodaca, Miguel
Montes, Fabiola Gomez and Keith H. Pannell*
Mixed aryl-alkyl organotin compounds,
ArnMeSnCl3-n, Ar = RC6H4, R = H, ethyl, i-propyl, t-butyl; n-hexyl,
n-octyl and the effect of R upon antibiotic
activity.
J.
Appl. Organomet. Chem. 2005, 19, 518
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Actinide Extractants
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Paulette Guillory, Ramesh
N. Kapoor, Keith H. Pannell, Louis. Schulte,
Stephen D. McKee, Z-Y Zhang, Richard C. Bartsch. High Yield,
One Pot Synthesis of symmetrical Diaryl-N,N-Dialkyl Carbamoylphosphine
Oxide (CMPO) Ligands. Synthetic. Communications 2003, 33,
325
Crowe, Mathew C.; Kapoor,
Ramesh N.; Cervantes-Lee, Francisco; Parkanyi, Laszlo;Schulte,
Louis; Pannell, Keith H.; Brodbelt, Jennifer S.
Investigating Bidentate and Tridentate Carbomoylmethylphosphine Oxide Ligand
Interactions with Rare-Earth Elements Using Electrospray
Ionization Quadrupole Ion Trap Mass Spectrometry. Inorg. Chem. 2005, 44,
6415-6424
Ramesh
N. Kapoor, Paulette Guillory, Louis Schulte,
Francisco Cervantes-Lee, Ionel Haiduc,
Laszlo Parkanyi and Keith H. Pannell.
Di(p-tert-butylphenyl)-N,N-di-(iso-butyl)carbamoylmethylphosphine
Oxide and its Organotin and Uranyl
Adducts: Structural and Spectroscopic Characterization.
Appl. Organomet.
Chem. 2005, 19, 510
Miscellaneous
Antonio Guzman-Durán,
E. Guzmán, K. H. Pannell and W. D. Lloyd.
Synthesis of (E,Z)-5-Bromo-1,1-dimethoxy-5-trimethylsilyl-4-
pentene, an Upper Chain Allenic Prostaglandin
Building Block.
Synthetic Communications. 2003, 33, 3271-3283
Sharma, H. K., Pannell, K. H. Lead.
Organometallic Chemistry, Encyclopedia of Inorganic
Chemistry, Second edition, Editor in Chief, R. B. King, J. Wiley & Sons.
Volume 5, 2005, 2671.
K. H. Pannell.
Coordination and Organometallic Chemistry of
Germanium, Tin and Lead.
Chemistry International (IUPAC); Conference Call. 2005, 27.
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