Department of Chemistry

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Keith H. Pannell

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ph.D.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Professor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Room : PSCI 307

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tel : 915-747-5796

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fax : 915-747-5748 or 915-747-5972

 

 

 

 

 

 

 

 

 

 

 

Email: kpannell@utep.edu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

University Degrees

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1962 B.S. Durham University, England.
1963 M.S. Durham University, England.
1966 Ph.D. University of Toronto, Canada.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research Interests

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ferrocenylene silane, germane and stannane polymers and related ferrocenyl complexes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

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  

 

 

Transition metal oligosilyl complexes

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