Ron Rulkens - Academia.edu (original) (raw)
Papers by Ron Rulkens
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Chemistry of Materials, May 1, 1995
... (b) Foucher, D. A,; Ziembinski, R.; Rulkens, R.; Nelson, J.; Manners, I. Inorganic and ... we... more ... (b) Foucher, D. A,; Ziembinski, R.; Rulkens, R.; Nelson, J.; Manners, I. Inorganic and ... were used, 2.5,5, and 10 Mrad, the dose rate being 0.88 Mrad/h. It was observed that on completion of a given irradiation, the temperature of the enclosure chamber was never more than 38 "C ...
Phosphorus Sulfur and Silicon and The Related Elements, Mar 1, 1993
ABSTRACT Polymers which contain inorganic elements are attracting considerable attention because ... more ABSTRACT Polymers which contain inorganic elements are attracting considerable attention because they provide access to materials with interesting, unusual and potentially useful properties. In this paper we emphasize some of our recent work aimed at exploiting ring-opening polymerization as a route to new inorganic and organometallic polymers containing the main group element phosphorus. For example, attempts to prepare new polymers which also contain boron are reported. In addition, recent results on the ring-opening polymerization of [1]- metallocenophanes such as cyclic ferrocenylsilanes and cyclic ferrocenylphosphines, which possess strained ring-tilted structures, are described. Finally, some recent research on poly(thionylphosphazenes), a novel class of inorganic polymers with sulphur(VI)-nitrogen-phosphorus backbones, is discussed.
Organometallics, Dec 1, 1995
ABSTRACT A series of phosphorus(III)-bridged [1]ferrocenophanes Fe[(eta-C(5)H(3)R)(eta-C(5)H(3)R&... more ABSTRACT A series of phosphorus(III)-bridged [1]ferrocenophanes Fe[(eta-C(5)H(3)R)(eta-C(5)H(3)R')]PX (X = Ph, R = R' = H (3); X = Cl, R = R' = H (4); X = Ph, R = H, R' = (II)Bu (5); X = Ph, R = R' = SiMe(3) (6)) have been synthesized via the reaction of Fe[(eta-C(5)H(3)R'Li)(eta-C(5)H(3)R'Li)]. nTMEDA with PXCl(2) (X = Cl, Ph). The reaction of 6 with an excess of elemental sulfur resulted in the quantitative formation of the phosphorus(V)-bridged species Fe[eta-C(5)H(3)SiMe(3)]P-2(S)Ph (7). The new compounds 4-7 were characterized by multinuclear NMR, by mass spectrometry and, in the cases of 4, 6, and a, by single-crystal X-ray diffraction and elemental analysis. Ring-tilt angles (alpha) for 4 and 6 were found to be typical of phosphorus(III)-bridged [1]ferrocenophanes (4, 27.0(6)degrees; 6, 27.5(6)degrees) whereas in the case of the phosphorus(V)-bridged species 7 the tilt angle was slightly less (alpha = 25.3(3)degrees). The thermal ring-opening polymerization of 3, 5, and 6 at 120-250 degrees C yielded the poly(ferrocenylphosphines) 8-10, respectively. These materials were characterized by multinuclear NMR and by elemental analysis. The molecular weight of the trimethylsilyl-substituted polymer 10 was determined by GPC in THF versus polystyrene standards to be M(w) = 66 000, PDI = 1.98, whereas 8 and 9 failed to elute from the GPC column. The phosphorus(V)-bridged species 7 also underwent thermal ring-opening polymerization to yield the poly(ferrocenylphosphine sulfide) 13 which was analyzed by GPC (M(w) = 22 000, PDI = 1.24); thermally-induced elimination of S(SiMe(3))(2) from the ring-opened polymer was identified as a side reaction. The macromolecular reactions of 8-10 with elemental sulfur yielded the poly(ferrocenylphosphine sulfides) 11-13. These were structurally characterized by multinuclear NMR and elemental analysis and their molecular distributions were analyzed by GPC (M(w) = 18 000-65 000, PDI = 1.5-2.3).
ChemInform, Aug 17, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
![Research paper thumbnail of Transition metal catalyzed ring-opening polymerization of silicon-bridged [1]ferrocenophanes at ambient temperature](https://attachments.academia-assets.com/111693473/thumbnails/1.jpg)
](Macromolecular Rapid Communications, Sep 1, 1995
A new route to poly(ferrocenylsi1anes) under mild conditions via the ring-opening polymerization ... more A new route to poly(ferrocenylsi1anes) under mild conditions via the ring-opening polymerization of silicon-bridged [llferrocenophanes is presented. Catalytic amounts of the transition metal complexes [Rh(cyclooctene),~-Cl)]2, Pd(1 ,5-cyclooctadiene)C12, PdCI, and PtCl, in C6D6 at room temperature afforded high molecular weight poly(ferrocenylsi1anes) (2). In some cases a symmetrical dimer (3) was obtained as a byproduct.
Chemistry: A European Journal, Nov 2, 1998
Abstract Novel tin-bridged [1] ferrocenophanes (1) undergo ring-opening polymerization to yield u... more Abstract Novel tin-bridged [1] ferrocenophanes (1) undergo ring-opening polymerization to yield unusual bimetallic high-molecular-weight poly (ferrocenylstannane) s (2). They also undergo insertion of platinum to afford a 1-stanna-2-platina [2] ferrocenophane (3).
ChemInform, Jun 19, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The recent discovery of the ring-opening polymerization of cyclic ferrocenylsilanes to yield high... more The recent discovery of the ring-opening polymerization of cyclic ferrocenylsilanes to yield high molecular weight poly(ferrocenylsilanes) suggested that analogous species containing different elements in the bridge structure might also yield novel polymers. This presentation reports studies on the polymerization of cyclic ferrocenylgermanics and cyclic ferrocenylphosphines to yield high polymers.
Journal of the American Chemical Society, 1992
Chemical Society Reviews, 2012
The discovery of decamethyldizincocene [Zn(2)(η(5)-Cp*)(2)] (Cp* = C(5)Me(5)), the first complex ... more The discovery of decamethyldizincocene [Zn(2)(η(5)-Cp*)(2)] (Cp* = C(5)Me(5)), the first complex containing a covalent zinc-zinc bond, by Carmona in 2004 initiated the search for this remarkable class of compounds. Low-valent organozinc complexes can either be formed by ligand substitution reactions of [Zn(2)(η(5)-Cp*)(2)] or by reductive coupling reactions of Zn(ii) compounds. To the best of our knowledge, until now 25 low-valent Zn-Zn bonded molecular compounds stabilized by a variety of sterically demanding, very often chelating, organic ligands have been synthesized and characterized. There are two major reaction pathways of [Zn(2)(η(5)-Cp*)(2)]: it can either react with cleavage of the Zn-Zn bond or by ligand substitution. In addition, upon reaction with late transition metal complexes, [Zn(2)(η(5)-Cp*)(2)] was found to form novel intermetallic complexes with Cp*Zn and Cp*Zn(2) acting as unusual one-electron donor ligands. Very recently, the potential capability of [Zn(2)(η(5)-Cp*)(2)] to serve as a suitable catalyst in hydroamination reactions was demonstrated. Finally, the recent work on Cd-Cd bonded coordination compounds is reviewed.
Acta Crystallographica Section C Crystal Structure Communications, 1994
ABSTRACT The title compound 1,1'-bis(ferrocenyldimethylsilyl)-ferrocene, [{C5H5-Fe-C5H4-S... more ABSTRACT The title compound 1,1'-bis(ferrocenyldimethylsilyl)-ferrocene, [{C5H5-Fe-C5H4-Si(Me(2))-C5H4}Fe-2] {or bis-[1,3(eta(5))- cyclopentadienyl][mu-1(eta(5)):2(eta(5))-dimethylsilane-diyldicyclopentadienyl] [mu-2(eta(5)):3(eta(5))-dimethylsilanediyldicyclopentadienyl]triiron, [Fe-3(C5H5)(2)(C12H14Si)(2)]}- is an oligomer containing three ferrocene units. The intramolecular Fe...Fe distance is 6.188 (1) Angstrom.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Chemistry of Materials, May 1, 1995
... (b) Foucher, D. A,; Ziembinski, R.; Rulkens, R.; Nelson, J.; Manners, I. Inorganic and ... we... more ... (b) Foucher, D. A,; Ziembinski, R.; Rulkens, R.; Nelson, J.; Manners, I. Inorganic and ... were used, 2.5,5, and 10 Mrad, the dose rate being 0.88 Mrad/h. It was observed that on completion of a given irradiation, the temperature of the enclosure chamber was never more than 38 "C ...
Phosphorus Sulfur and Silicon and The Related Elements, Mar 1, 1993
ABSTRACT Polymers which contain inorganic elements are attracting considerable attention because ... more ABSTRACT Polymers which contain inorganic elements are attracting considerable attention because they provide access to materials with interesting, unusual and potentially useful properties. In this paper we emphasize some of our recent work aimed at exploiting ring-opening polymerization as a route to new inorganic and organometallic polymers containing the main group element phosphorus. For example, attempts to prepare new polymers which also contain boron are reported. In addition, recent results on the ring-opening polymerization of [1]- metallocenophanes such as cyclic ferrocenylsilanes and cyclic ferrocenylphosphines, which possess strained ring-tilted structures, are described. Finally, some recent research on poly(thionylphosphazenes), a novel class of inorganic polymers with sulphur(VI)-nitrogen-phosphorus backbones, is discussed.
Organometallics, Dec 1, 1995
ABSTRACT A series of phosphorus(III)-bridged [1]ferrocenophanes Fe[(eta-C(5)H(3)R)(eta-C(5)H(3)R&... more ABSTRACT A series of phosphorus(III)-bridged [1]ferrocenophanes Fe[(eta-C(5)H(3)R)(eta-C(5)H(3)R')]PX (X = Ph, R = R' = H (3); X = Cl, R = R' = H (4); X = Ph, R = H, R' = (II)Bu (5); X = Ph, R = R' = SiMe(3) (6)) have been synthesized via the reaction of Fe[(eta-C(5)H(3)R'Li)(eta-C(5)H(3)R'Li)]. nTMEDA with PXCl(2) (X = Cl, Ph). The reaction of 6 with an excess of elemental sulfur resulted in the quantitative formation of the phosphorus(V)-bridged species Fe[eta-C(5)H(3)SiMe(3)]P-2(S)Ph (7). The new compounds 4-7 were characterized by multinuclear NMR, by mass spectrometry and, in the cases of 4, 6, and a, by single-crystal X-ray diffraction and elemental analysis. Ring-tilt angles (alpha) for 4 and 6 were found to be typical of phosphorus(III)-bridged [1]ferrocenophanes (4, 27.0(6)degrees; 6, 27.5(6)degrees) whereas in the case of the phosphorus(V)-bridged species 7 the tilt angle was slightly less (alpha = 25.3(3)degrees). The thermal ring-opening polymerization of 3, 5, and 6 at 120-250 degrees C yielded the poly(ferrocenylphosphines) 8-10, respectively. These materials were characterized by multinuclear NMR and by elemental analysis. The molecular weight of the trimethylsilyl-substituted polymer 10 was determined by GPC in THF versus polystyrene standards to be M(w) = 66 000, PDI = 1.98, whereas 8 and 9 failed to elute from the GPC column. The phosphorus(V)-bridged species 7 also underwent thermal ring-opening polymerization to yield the poly(ferrocenylphosphine sulfide) 13 which was analyzed by GPC (M(w) = 22 000, PDI = 1.24); thermally-induced elimination of S(SiMe(3))(2) from the ring-opened polymer was identified as a side reaction. The macromolecular reactions of 8-10 with elemental sulfur yielded the poly(ferrocenylphosphine sulfides) 11-13. These were structurally characterized by multinuclear NMR and elemental analysis and their molecular distributions were analyzed by GPC (M(w) = 18 000-65 000, PDI = 1.5-2.3).
ChemInform, Aug 17, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Macromolecular Rapid Communications, Sep 1, 1995
A new route to poly(ferrocenylsi1anes) under mild conditions via the ring-opening polymerization ... more A new route to poly(ferrocenylsi1anes) under mild conditions via the ring-opening polymerization of silicon-bridged [llferrocenophanes is presented. Catalytic amounts of the transition metal complexes [Rh(cyclooctene),~-Cl)]2, Pd(1 ,5-cyclooctadiene)C12, PdCI, and PtCl, in C6D6 at room temperature afforded high molecular weight poly(ferrocenylsi1anes) (2). In some cases a symmetrical dimer (3) was obtained as a byproduct.
Chemistry: A European Journal, Nov 2, 1998
Abstract Novel tin-bridged [1] ferrocenophanes (1) undergo ring-opening polymerization to yield u... more Abstract Novel tin-bridged [1] ferrocenophanes (1) undergo ring-opening polymerization to yield unusual bimetallic high-molecular-weight poly (ferrocenylstannane) s (2). They also undergo insertion of platinum to afford a 1-stanna-2-platina [2] ferrocenophane (3).
ChemInform, Jun 19, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The recent discovery of the ring-opening polymerization of cyclic ferrocenylsilanes to yield high... more The recent discovery of the ring-opening polymerization of cyclic ferrocenylsilanes to yield high molecular weight poly(ferrocenylsilanes) suggested that analogous species containing different elements in the bridge structure might also yield novel polymers. This presentation reports studies on the polymerization of cyclic ferrocenylgermanics and cyclic ferrocenylphosphines to yield high polymers.
Journal of the American Chemical Society, 1992
Chemical Society Reviews, 2012
The discovery of decamethyldizincocene [Zn(2)(η(5)-Cp*)(2)] (Cp* = C(5)Me(5)), the first complex ... more The discovery of decamethyldizincocene [Zn(2)(η(5)-Cp*)(2)] (Cp* = C(5)Me(5)), the first complex containing a covalent zinc-zinc bond, by Carmona in 2004 initiated the search for this remarkable class of compounds. Low-valent organozinc complexes can either be formed by ligand substitution reactions of [Zn(2)(η(5)-Cp*)(2)] or by reductive coupling reactions of Zn(ii) compounds. To the best of our knowledge, until now 25 low-valent Zn-Zn bonded molecular compounds stabilized by a variety of sterically demanding, very often chelating, organic ligands have been synthesized and characterized. There are two major reaction pathways of [Zn(2)(η(5)-Cp*)(2)]: it can either react with cleavage of the Zn-Zn bond or by ligand substitution. In addition, upon reaction with late transition metal complexes, [Zn(2)(η(5)-Cp*)(2)] was found to form novel intermetallic complexes with Cp*Zn and Cp*Zn(2) acting as unusual one-electron donor ligands. Very recently, the potential capability of [Zn(2)(η(5)-Cp*)(2)] to serve as a suitable catalyst in hydroamination reactions was demonstrated. Finally, the recent work on Cd-Cd bonded coordination compounds is reviewed.
Acta Crystallographica Section C Crystal Structure Communications, 1994
ABSTRACT The title compound 1,1'-bis(ferrocenyldimethylsilyl)-ferrocene, [{C5H5-Fe-C5H4-S... more ABSTRACT The title compound 1,1'-bis(ferrocenyldimethylsilyl)-ferrocene, [{C5H5-Fe-C5H4-Si(Me(2))-C5H4}Fe-2] {or bis-[1,3(eta(5))- cyclopentadienyl][mu-1(eta(5)):2(eta(5))-dimethylsilane-diyldicyclopentadienyl] [mu-2(eta(5)):3(eta(5))-dimethylsilanediyldicyclopentadienyl]triiron, [Fe-3(C5H5)(2)(C12H14Si)(2)]}- is an oligomer containing three ferrocene units. The intramolecular Fe...Fe distance is 6.188 (1) Angstrom.