# positions[].organizations[].parent[].label
Texas A&M Engineering Experiment Station (TEES)

# overview
Major research interests in my group include (1) immobilized catalysts, (2) the surface chemistry of oxide materials and (3) solid-state NMR spectroscopy.

Immobilized catalysts (1) allow the advantages of heterogeneous catalysts to be combined with those of homogeneous catalysts. In particular, surface-immobilized homogeneous catalysts are easy to recycle, and can be highly active and selective. Furthermore they are amenable to systematic design. We find the most interesting results when heterobimetallic systems, such as the Sonogashira Pd/Cu catalyst for the coupling of aryl halides and terminal alkynes, are involved. Effective immobilization requires a thorough understanding of the surface chemistry of the oxide support materials (2). Therefore, we investigate not only the reactivity of metal complexes and linkers, but also their mobility on the surfaces.

The most powerful analytical tool for investigating amorphous materials is solid-state NMR spectroscopy (3). We optimized this method especially for surface-bound species, enabling us to study reactions on surfaces, or analyze the nature of our anchored linkers and catalysts.

These different research areas provide my students with a strong multidisciplinary background, spanning from synthetic chemistry, through materials sciences and catalysis, to surface analytical methods including solid-state NMR spectroscopy. Our expertise in these fields has led to many industrial contacts and collaborations.

# keywords[]
0306 Physical Chemistry (incl. Structural)

# keywords[]
0306 Physical Chemistry (incl. Structural)

# keywords[]
3403 Macromolecular And Materials Chemistry

# keywords[]
0306 Physical Chemistry (incl. Structural)

# educationAndTraining[].organization.label
Technical University Munich - (Munich, Germany)

# publications[].label
Synthesis and characterization of phosphine oxides and their hydrogen peroxide adducts

# publications[].label
Monometallic Ni(0) and Heterobimetallic Ni(0) /Au(I) Complexes of Tripodal Phosphine Ligands: Characterization in Solution and in the Solid State and Catalysis.

# publications[].label
Synthesis, Immobilization, MAS and HR-MAS NMR of a New Chelate Phosphine Linker System, and Catalysis by Rhodium Adducts Thereof

# publications[].label
Immobilization and chelation of metal complexes with bifunctional phosphine ligands: A solid-state NMR study

# publications[].label
Linkers and catalysts immobilized on oxide supports: New insights by solid-state NMR spectroscopy

# publications[].label
REACTIONS OF PHOSPHINES WITH SILICA - A SOLID-STATE NMR-STUDY

# publications[].label
THE INTRIGUING STRUCTURAL CHARACTERISTICS OF THE HETEROSILOXANE MOLECULE NA4[SB2O(OSIME3)8]

# publications[].label
Tetraphosphines with tetra(biphenyl) silane and - stannane cores as rigid scaffold linkers for immobilized catalysts

# publications[].label
Multinuclear Solid-State NMR Investigation of the Moisture Distribution in PEEK-PBI and PEKK-PBI Blends

# publications[].label
DIPHENYLPHOSPHINE-SUBSTITUTED, CHIRAL POLYEPICHLOROHYDRIN, A SUPPORT FOR THE HETEROGENEOUS ASYMMETRIC CATALYSIS (VOL 48B, PG 1589, 1993)

# publications[].label
H2O2 adducts of phosphine oxides: Safe, solid, stoichiometric, and soluble new oxidizing agents

# publications[].label
Rigid tetraphenylelement linker scaffolds that prevent interactions of catalysts with oxide supports

# publications[].label
Rigid tetra(biphenyl)element linker scaffolds for immobilizing catalysts on oxide supports

# publications[].label
A Nontemplated Route to Macrocyclic Dibridgehead Diphosphorus Compounds: Crystallographic Characterization of a "Crossed-Chain" Variant of in/out Stereoisomers.

# publications[].label
Synthesis and NMR spectroscopy of metallocenium ions. Support for a new ferromagnetic coupling mechanism in decamethylmetallocenium tetracyanoethenides

# publications[].label
The adsorption of chromocene and ferrocene on silica: A solid-state NMR study

# publications[].label
Immobilized Sonogashira catalyst systems: new insights by multinuclear HRMAS NMR studies.

# publications[].label
P-31 CP/MAS NMR of polycrystalline and immobilized phosphines and catalysts with fast sample spinning

# publications[].label
Selective synthesis and stabilization of peroxides via phosphine oxides

# publications[].label
PHOTOCHEMICAL 1,2 SHIFT OF THE PHOSPHANE LIGANDS IN THE SILANEDIYL COMPLEX [(2-PH2PCH2C6H4)2SI=CR(CO)5]

# publications[].label
DIRECT AND INDIRECT METALATION OF ENDO-DICYCLOPENTADIENE - SN-119 NMR-STUDIES AND C-13 NMR-STUDIES OF STANNYLATED DERIVATIVES

# publications[].label
The Union Carbide catalyst (Cp(2)Cr+SiO2) studied by solid-state NMR

# publications[].label
Di(hydroperoxy)cycloalkane Adducts of Triarylphosphine Oxides: A Comprehensive Study Including Solid-State Structures and Association in Solution.

# publications[].label
Reactions of ethoxysilanes with silica: A solid-state NMR study

# publications[].label
REVERSIBLE INTRAMOLECULAR BASE STABILIZATION IN SILYLENE (SILANEDIYL) COMPLEXES - SURPRISING REACTIVITY FOR SILYLENE COORDINATION-COMPOUNDS WITH A DYNAMIC N...SI...N BOND

# publications[].label
Homogeneous and immobilized Ni tripod complexes: Syntheses, 2D liquid- and solid-state NMR, and catalysis

# publications[].label
New hydrogen bonding motifs of phosphine oxides with a silanediol, a phenol, and chloroform

# publications[].label
Immobilized Sonogashira catalyst systems for C-C coupling reactions: New mechanistic insights and improved recyclability

# publications[].label
Structures and unexpected dynamic properties of phosphine oxides adsorbed on silica surfaces.

# publications[].label
Hydrogen-Bonded Di(hydroperoxy)alkane Adducts of the Type Cy3P=O(HOO)2CHR (R = Alkyl).

# publications[].label
Immobilized nickel catalysts for cyclotrimerizations of acetylenes: enhancement of activities, stabilities, and lifetimes

# publications[].label
Di(hydroperoxy)cycloalkanes Stabilized via Hydrogen Bonding by Phosphine Oxides: Safe and Efficient Baeyer-Villiger Oxidants

# publications[].label
The Palladium Component of an Immobilized Sonogashira Catalyst System: New Insights by Multinuclear HRMAS NMR Spectroscopy

# publications[].label
NMR-SPECTROSCOPY OF PARAMAGNETIC-COMPLEXES .37. SYNTHESIS AND NMR-SPECTROSCOPY OF METALLOCENIUM IONS - SUPPORT FOR A NEW FERROMAGNETIC COUPLING MECHANISM IN DECAMETHYLMETALLOCENIUM TETRACYANOETHENIDES

# publications[].label
High-temperature steam-treatment of PBI, PEEK, and PEKK polymers with H2O and D2O: A solid-state NMR study

# publications[].label
Immobilized di(hydroperoxy)propane adducts of phosphine oxides as traceless and recyclable oxidizing agents

# publications[].label
Synthesis, immobilization, and solid-state NMR of new phosphine linkers with long alkyl chains

# publications[].label
SUSPENSION NMR-SPECTROSCOPY OF PHOSPHINES AND CARBONYLNICKEL COMPLEXES IMMOBILIZED ON SILICA

# publications[].label
Rhodium and nickel catalysts immobilized on oxidic supports.

# publications[].label
INOR 1049-Di- and tetraphosphine linkers immobilized by a new, easy method: Novel scaffolds that diminish interactions of catalysts with oxide supports

# publications[].label
Di(hydroperoxy)alkane Adducts of Phosphine Oxides: Safe, Solid, Stoichiometric, and Soluble Oxidizing Agents

# publications[].label
Solid-state NMR spectroscopy for the comprehensive structural and dynamic characterization of covalently bound and surface-adsorbed catalysts

# publications[].label
Synthesis and properties of trimesitylthallium. A comparison of the trimesitylelement compounds of group 13

# publications[].label
Ferrocene Adsorbed on Silica and Activated Carbon Surfaces: A Solid-State NMR Study of Molecular Dynamics and Surface Interactions

# publications[].label
New linker systems for superior immobilized catalysts

# publications[].label
Solid, stable, soluble, and stoichiometric oxidizing agents: Hydrogen peroxide and di(hydroperoxy)alkane adducts of phosphine oxides

# publications[].label
Adsorption of phosphines, phosphine oxides, and phosphonium salts on silica surfaces: New insights by solid-state NMR spectroscopy

# publications[].label
New bifunctional chelating phosphine ligands for immobilization of metal complexes on oxidic supports

# publications[].label
Immobilization of phosphines on silica: identification of byproducts via 31P CP/MAS studies of model alkyl-, aryl-, and ethoxyphosphonium salts.

# publications[].label
Molecular Dynamics and Surface Interactions of Nickelocene Adsorbed on Silica: A Paramagnetic Solid-State NMR Study.

# publications[].label
METALATED BICYCLO[3.2.2]NONA-2,6,8-TRIENES, THEIR REARRANGEMENT TO BARBARALANES, AND A SHORT SYNTHESIS OF THE BICYCLO[3.2.2]NONA-2,6,8-TRIEN-4-YL ANION

# publications[].label
Dynamic and topological properties of dibridgehead diphosphines and their oxides

# publications[].label
REACTIVITY AND DYNAMICS OF BIFUNCTIONAL PHOSPHINES IMMOBILIZED ON OXIDIC SUPPORTS - A SOLID-STATE NMR-STUDY

# publications[].label
Syntheses of diphosphine and diphosphine dioxide cages

# publications[].label
Substitution and Catalytic Chemistry of Gyroscope-Like Complexes Derived from Cl-Rh-CO Rotators and Triply trans Spanning Di(trialkylphosphine) Ligands

# publications[].label
Hydrogen peroxide adducts of triarylphosphine oxides.

# publications[].label
SOLID-STATE NMR-STUDY SUPPORTING THE LITHIUM VACANCY DEFECT MODEL IN CONGRUENT LITHIUM-NIOBATE

# publications[].label
Study of paramagnetic chromocenes by solid-state NMR spectroscopy

# publications[].label
X-ray powder diffraction characterization of the elusive tetraphosphine Si(CH2PPh2)(4) silane

# publications[].label
Synthesis and characterization of tridentate phosphine ligands incorporating long methylene chains and ethoxysilane groups for immobilizing molecular rhodium catalysts

# publications[].label
Moisture distribution in PEEK, PEKK, PBI, and their blends: A multinuclear solid-state NMR study

# publications[].label
Immobilized Sonogashira catalyst systems: New mechanistic insights and improved recyclability

# publications[].label
Adsorption of Ferrocene on Carbon Nanotubes, Graphene, and Activated Carbon

# publications[].label
Disentangling different modes of mobility for triphenylphosphine oxide adsorbed on alumina.

# publications[].label
Synthesis and Fabrication of Multifunctional Nanocomposites: Stable Dispersions of Nanoparticles Tethered with Short, Dense and Polydisperse Polymer Brushes in Poly(methyl methacrylate)

# publications[].label
Benzene Adsorbed on Activated Carbon: A Comprehensive Solid-State Nuclear Magnetic Resonance Study of Interactions with the Pore Surface and Molecular Motions

# publications[].label
Synthesis, structure, immobilization and solid-state NMR of new dppp- and tripod-type chelate linkers

# publications[].label
NMR-SPECTROSCOPY OF PARAMAGNETIC-COMPLEXES .39. NATURAL ABUNDANCE H-2-NMR OF PARAMAGNETIC SANDWICH COMPOUNDS

# publications[].label
Di(hydroperoxy)alkane Adducts of Phosphine Oxides: Safe, Solid, Stoichiometric, and Soluble Oxidizing Agents.

# publications[].label
SYNTHESIS AND CHEMISTRY OF HETEROBIMETALLIC FULVALENE COMPLEXES CONTAINING W, MO, AND RH

# publications[].label
Phosphine oxide adsorption on silica surfaces

# publications[].label
High-temperature steam-treatment of PBI, PEKK, and a PEKK-PBI Blend: A solid-state NMR and IR spectroscopic study

# publications[].label
Adsorption of Ruthenium and Iron Metallocenes on Silica: A Solid-State NMR Study

# publications[].label
Transition metal complexes of diazenes .37. Heterogeneous Rh(I) catalysis: Synthesis of N-anilino-2,3-diphenylindole from azobenzene and diphenylacetylene

# publications[].label
Molecular organometallic Pd, Cu, and Rh catalysts immobilized on oxide supports

# publications[].label
The Ferromagnetic Coupling Mechanism in Hetallocenium/-Anion Stacks as seen by NMR Spectroscopy

# publications[].label
Hydrogen peroxide and dihydroperoxy alkane adducts of phosphine oxides as solid, stoichiometric, and soluble oxidizing agents

# publications[].label
ALKALI-METAL AND STANNYL DERIVATIVES OF BICYCLIC AND TRICYCLIC ANIONS

# publications[].label
Metallocenes adsorbed on silica and activated carbon: Solid-State NMR and catalysis

# publications[].label
Improved rhodium hydrogenation catalysts immobilized on oxidic supports

# publications[].label
Bifunctional phosphines immobilized on inorganic oxides

# publications[].label
Synthesis, structure, electronic properties and thermal behavior of butadiynyl substituted phenylCr(CO)(3)-complexes

# publications[].label
MULTIPLE BONDS BETWEEN MAIN-GROUP ELEMENTS AND TRANSITION-METALS .130. (CYCLOPENTADIENYL)TRIOXORHENIUM(VII) - SYNTHESIS, DERIVATIVES, AND PROPERTIES

# publications[].label
Chelate phosphine linkers with long alkyl chains for immobilizing catalysts on oxide supports

# publications[].label
Improved rhodium hydrogenation catalysts immobilized on silica

# publications[].label
MULTIPLE BONDS BETWEEN MAIN-GROUP ELEMENTS AND TRANSITION-METALS .137. POLYMERIC METHYLTRIOXORHENIUM - AN ORGANOMETALLIC NANOSCALE DOUBLE-LAYER STRUCTURE OF CORNER-SHARING REO5(CH3) OCTAHEDRA WITH INTERCALATED WATER-MOLECULES

# publications[].label
THE FERROMAGNETIC COUPLING MECHANISM IN METALLOCENIUM PI-ANION STACKS AS SEEN BY NMR-SPECTROSCOPY

# publications[].label
Gyroscope-Like Complexes Based on Dibridgehead Diphosphine Cages That Are Accessed by Three-Fold Intramolecular Ring Closing Metatheses and Encase Fe(CO)3, Fe(CO)2(NO)(+), and Fe(CO)3(H)(+) Rotators.

# publications[].label
Coordination of alane and aluminum alkyls to the N-donor atom of side chain functionalized cyclopentadienyl iron and nickel complexes; structure of {[(C5H5)(C5H4CH2NMe2)]Fe}(2)AlH3

# publications[].label
Immobilization of bisphosphinoamine linkers on silica: Identification of previously unrecognized byproducts via (31)p CP/MAS and suspension HR-MAS studies

# publications[].label
Rigid tetraphenylelement linker scaffolds for immobilizing catalysts on oxide supports

# publications[].label
Adsorption of phosphines, phosphine oxides, and phosphonium salts on silica surfaces: New insights by solid-state NMR spectroscopy

# publications[].id
 Synthesis, structure, and dynamic behavior of a missing link in a series of square-planar platinum complexes

# publications[].label
Generation of trans-spanning diphosphine ligands via alkene metathesis

# publications[].label
Synthesis, purification, and characterization of phosphine oxides and their hydrogen peroxide adducts.

# publications[].label
Immobilization of carbonylnickel complexes: A solid-state NMR study

# publications[].label
Porous Polymer Networks: Synthesis, Porosity, and Applications in Gas Storage/Separation

# publications[].label
METALLOCENE ANALOGS WITH SPLIT (2+4)-PI-ELECTRON LIGANDS

# publications[].label
Chelate phosphine linkers with long alkyl chains: Sonogashira and rhodium catalysts immobilized on oxide supports

# publications[].label
Synthesis and properties of trimesitylthallium. A comparison of the trimesitylelement compounds of group 13

# publications[].label
Surface compounds of transition metals. XLI - Preparation and properties of organochromium compounds by reaction of Phillips catalysts with ethylene

# publications[].label
Motions of adsorbed and covalently bound molecules on silica surfaces: A solid-state NMR study

# publications[].label
Solid-state HRMAS NMR as a powerful method for investigating linkers and catalysts immobilized on oxide supports

# publications[].label
Degradation mechanisms of high performance polymers in extreme environments

# publications[].label
ANALOGS OF METALLOCENES WITH SEPARATED ALLYL AND OLEFIN SYSTEMS

# publications[].label
Hydrogen Peroxide and Di(hydroperoxy)propane Adducts of Phosphine Oxides as Stoichiometric and Soluble Oxidizing Agents.

# publications[].label
Di(hydroperoxy)adamantane adducts: synthesis, characterization and application as oxidizers for the direct esterification of aldehydes.

# publications[].label
Creating Solid Solutions of Metallocenes: Migration of Nickelocene into the Ferrocene Crystal Lattice in the Absence of a Solvent

# publications[].label
Two types of intramolecular Lewis-base adducts with the [2-(dimethylamino)ethyl]cyclopentadienyl ligand: Synthesis and crystal structures of {5:1-C5H4[(CH 2)2NMe2]}Ni-I and {5--C5H4[(CH2) 2NMe2]}(Me3P)Ni-InI2

# publications[].label
Structures and Dynamics of Secondary and Tertiary Alkylphosphine Oxides Adsorbed on Silica.

# publications[].label
New mechanistic insights regarding Pd/Cu catalysts for the Sonogashira reaction: HRMAS NMR studies of silica-immobilized systems.

# publications[].label
New silica-immobilized nickel catalysts for cyclotrimerizations of acetylenes

# publications[].label
Dibridgehead diphosphine dioxide cages: Syntheses and unusual structural features

# publications[].label
Easily immobilized di- and tetraphosphine linkers: rigid scaffolds that prevent interactions of metal complexes with oxide supports.

# publications[].label
STEPWISE STACKING OF 3 PARAMAGNETIC METALLOCENE UNITS - [CPNICP(SIME2)2CPCRCP(SIME2)2CPNICP]

# publications[].label
INOR 950-Sonogashira catalyst systems immobilized on oxide supports: New insights by classical solid-state and suspension NMR

# publications[].label
Easy one-pot synthesis of new dppm-type linkers for immobilizations.

# publications[].label
REACTIONS OF ETHOXYSILANES WITH SILICA - A SOLID-STATE NMR-STUDY

# publications[].label
Phenomena observed in solid-state NMR spectroscopy when adsorbing phosphines, phosphine oxides, and metallocenes on silica surfaces

# publications[].label
Molecular organometallic catalysts immobilized on oxide supports

# publications[].label
(14)N NMR and two-dimensional suspension (1)H and (13)C HRMAS NMR spectroscopy of ionic liquids immobilized on silica.

# researcherOn[].label
New Strategies for Creating Single and Dual Atom Catalysts on Silica Surfaces

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# researcherOn[].label
Rigid and Flexible Linker Systems for Superior Immobilized Catalysts

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# streetAddress
Texas A&M University; Chemistry Department; 3255 TAMU

# organizations[]
Texas A&M Engineering Experiment Station (TEES)

# schools[]
Texas A&M Engineering Experiment Station (TEES)

# etdChairOf[].label
Silbernagel, Rita Marie (2016-05). Tetravalent Metal Phosphonate-Phosphate Hybrids as Catalyst Supports and Ion Exchange Materials. Doctoral Dissertation.

# etdChairOf[].label
Ahn, Shin Hye (2017-12). Di(hydroperoxy)alkane Adducts of Phosphine Oxides: Safe, Solid, Stoichiometric and Soluble Oxidizing Agents. Doctoral Dissertation.

# etdChairOf[].label
Kharel, Sugam (2018-08). Topologically Novel Phosphorus Compounds and Metal Complexes. Doctoral Dissertation.

# etdChairOf[].label
Baker, Joseph Hugh Franklin (2017-12). Tetraphosphine Linkers for Immobilizing Catalysts and  Studies of Polymer Degradation Mechanisms. Doctoral Dissertation.

# etdChairOf[].label
Benzie, Jordon William (2020-12). NICKELOCENE, FERROCENE, AND BENZENE ADSORBED ON SILICA AND ACTIVATED CARBON: A SOLID-STATE NMR STUDY. Doctoral Dissertation.

# etdChairOf[].label
Kharel, Sugam (2018-07). Topologically Novel Phosphorus Compounds and Metal Complexes. Doctoral Dissertation.

# etdChairOf[].label
Pope, Jacqueline Christine (2014-12). Multinuclear Solid-State NMR Studies of Polymers and Immobilized Sonogashira Catalysts for Cross-Coupling Reactions. Doctoral Dissertation.

# etdChairOf[].label
Arp, Fabian Felix (2020-12). Peroxides Stabilized by Phosphine Oxides: Synthesis, Characterization, and Applications. Doctoral Dissertation.

# etdChairOf[].label
Steffensmeier, Eric Michael (2016-12). Tetraphosphines with Tetraphenylelement Cores as Linkers  in Catalysis and Surface Supported Synthesis. Doctoral Dissertation.

# etdChairOf[].label
Guenther, Johannes 1983- (2012-12). Tridentate Phosphine Linkers for Immobilized Catalysts: Development and Characterization of Immobilized Rhodium Complexes and Solid-State NMR Studies of Polymers. Doctoral Dissertation.

# etdChairOf[].label
Hilliard, Casie Renee (2013-12). Diphosphine Dioxide Cages and Hydrogen Peroxide Adducts of Phosphine Oxides: Syntheses and Applications in Surface Science. Doctoral Dissertation.

# etdChairOf[].label
Cluff, Kyle James (2016-05). Homogeneous and Immobilized Nickel Catalysts and Mobility Studies of Metallocenes Adsorbed on High Surface Area Materials. Doctoral Dissertation.

# etdChairOf[].label
Perera, Melanie Ingrid (2011-08). Tetraphosphine Linker Scaffolds with a Tetraphenyltin Core for Superior Immobilized Catalysts: A Solid-State NMR Study. Master's Thesis.