Taillandier, A.S., Domine, F., Simpson, W.R., Sturm, M., Douglas, T.A., Severin, K
The detailed physical characteristics of the subarctic snowpack must be known to quantify the exchange of adsorbed pollutants between the atmosphere and the snow cover. For the first time, the...
Quebatte, L., Scopelliti, R., Severin, K.
The homo- and heterobimetallic complexes [Cp*Ru(m-Cl)3-ML] [LM = (C6H6)Ru, (cymene)Ru, (1,3,5-C6H3iPr3)Ru, Cp*Rh, Cp*Ir] were prepd. by reaction of [Cp*Ru(m-OMe)]2 with Me3SiCl and subsequent addn....
Saur, I., Scopelliti, R., Severin, K.
The synthesis of water-sol., organometallic macrocycles is described. They were obtained by self-assembly in reactions of the half-sandwich complexes [{Ru(C6H5Me)Cl2}2], [{Ru(p-cymene)Cl2}2],...
Ruthenium Catalysts for the Kharasch Reaction (2006)
Recent advances in the development of ruthenium catalysts for the atom transfer radical addn. of polyhalogenated compds. to olefins ('Kharasch reaction') are described. Three classes of homogeneous...
Haas, M., Solari, E., Nguyen, Q. T., Gauthier, S., Scopelliti, R., Severin, K.
The bimetallic ruthenium complex [(1,3,5-C6H3i-Pr3)Ru(m-Cl)3RuCl(C2H4)(PCy3)] has been synthesized by reaction of [(1,3,5-C6H3i-Pr3)RuCl2)]2 with one equivalent of PCy3 in the presence of ethylene....
Zaubitzer, F., Buryak, A., Severin, K.
Indicator displacement assays based on the organometallic complex [Cp*RhCl2]2 and the dye gallocyanine have been used to sense aminosugars and aminoglycosides in buffered aqueous solution by UV-Vis...
Schiller, A, Scopelliti, R, Benmelouka, M, Severin, K
Three immobilized Cu(II) complexes were generated by the following: (a) homopolymerization of the N,N',N '' chelate ligand tris[2-(1-vinylimidazolyl)]phosphine (1) and subsequent metalation with...
Site-isolated porphyrin catalysts in imprinted polymers (2005)
Burri, E, Ohm, M, Daguenet, C, Severin, K
A meso-tetraaryl ruthenium porphyrin complex having four polymerizable vinylbenzoxy groups (2) has been synthesized by reaction of pyrrole with 4-(vinylbenzoxy)benzaldehyde and subsequent metalation...
Quebatte, L, Scopelliti, R, Severin, K
The cationic ruthenium half-sandwich complex [Cp*Ru(PPh3)(2)(CH3CN)][OTf] (2) (CP* = eta(5)-C5Me5, OTf = SO3CF3) was synthesized by reduction of [Cp*RuCl2](2) with zinc in the presence of NaOTf and...
A bimetallic ruthenium ethylene complex as a catalyst precursor for the Kharasch reaction (2005)
Quebatte, L, Solari, E, Seopelliti, R, Severin, K
A bimetallic complex, in which a RuCl2 (eta(2)C(2)H(4))(PCy3) fragment is connected via three chloro, bridges to a (eta(6)-p-cymene)RuCl2 fragment, has been synthesized and characterized by...
Neutral metallomacrocycles with four or ten (PEt3)Pd(II) centers (2005)
Brasey, T, Scopelliti, R, Severin, K
The reaction of [(Et3P)PdCl2](2) with 2,3-dihydroxypyridine, 5-chloro-2,3,-dihydroxypyridine, or 2-hydroxynicotinic acid in the presence of base gives neutral, metallomacrocyclic compounds in which...
Experimental data are presented which demonstrate that the target concentration has a strong influence on the outcome of selection experiments with a dynamic mixture of self-assembled receptors.
A heterobimetallic Ru(II)-Rh(I) complex has been identified as a potent catalyst precursor for the Oppenauer-type oxidation of alcohols. With 0.1-0.5 mol% of this complex and K2CO3 as the...
Gauthier, S, Scopelliti, R, Severin, K
The reaction of [RhCl(eta(4)-Ph2R2C4CO)](2) (R = Ph, 2-naphthyl) with the dimeric complexes [RuCl2(p-cymene)](2) p-cymene = 1-methyl-4-(1-methylethyl)benzene, [RuCl2(1,3,5-Et3C6H3)](2),...
Gauthier, S., Scopelliti, R., Severin, K.
The trinuclear Ru complexes [RuCl2(PAd2Bu)]3 (1) and [RuCl2(PtBu2Cy)]3 (2) were obtained by reaction of [(p-cymene)RuCl2]2 with 2 equiv of the resp. sterically demanding phosphine. Crystallog....
Dynamic Combinatorial Libraries of Dye-Complexes as Sensors (2005)
A simple soln.: Simply dissolving three com. available dyes and two metal salts in a buffer is sufficient to create a sensor which allows the identification of dipeptides with high selectivity by...
PH-Triggered assembly of organometallic receptors for lithium ions (2004)
Grote, Z, Scopelliti, R, Severin, K
The reaction of half-sandwich complexes of ruthenium, rhodium, and iridium with amino-substituted 3-hydroxy-2-pyridone ligands in aqueous solution gives monomeric O,O'-chelate complexes. Upon...
Vieille-Petit, L, Therrien, B, Buryak, A, Severin, K, Suss-Fink, G
The trinuclear arene-ruthenium cluster cation, [Ru3H3(O)(C10H14)2(C14H16O4)](+), has been synthesized and crystallized as the tetrafluoroborate (BF4-) salt. The cations form, along the b axis,...
Gauthier, S, Scopelliti, R, Severin, K
A heterobimetallic complex, in which a RuCl2(acetone) (PPh3)(2) fragment is connected via three chloro bridges to a (eta(4)-C4Ph4CO)RhCl fragment, has been identified as a potent catalyst precursor...
Combinatorial synthesis of bimetallic complexes with three halogeno bridges (2004)
Gauthier, S, Quebatte, L, Scopelliti, R, Severin, K
Methods for the synthesis of bimetallic complexes in which two different metal fragments are connected by three chloro or bromo bridges are reported. The reactions are general, fast, and give rise to...
A new method for the synthesis of boronate macrocycles (2004)
Christinat, N, Scopelliti, R, Severin, K
The condensation of aryl boronic acids with 2,3-dihydroxypyridine gives boronates, which self-assemble to form tetrameric macrocycles as evidenced by X-ray crystallographic analyses.
Numerical simulations are presented that describe the adaptive behavior of simple dynamic combinatorial libraries (DCLs) upon addition of a target. By studying the effect of various parameters such...
Gauthier, S, Quebatte, L, Scopelliti, R, Severin, K
The reaction of [RuCl3(AsPh3)(2)(MeOH)] with the dimeric complexes [(cod)RhCl](2), [(ppy)RhCl](2) (ppy = cyclometalated 2-phenylpyridine), [(cymene)RuCl2](2) and [CP*MCl2](2) (M = Rh, Ir) has been...
Diastereoselective formation of metallamacrocyclic (arene)Ru-II and Cp*Rh-III complexes (2004)
Lehaire, ML, Scopelliti, R, Herdeis, L, Polborn, K, Mayer, P, Severin, K
The reaction of [(arene)RuCl2](2) (arene = cymene, 1,3,5-C6H3Me3) and [Cp*RhCl2](2) half-sandwich complexes with tridentate heterocyclic ligands in the presence of base has been investigated. In all...
Synthesis of a metallamacrocyclic Re(CO)(3) complex using a tridentate bridging ligand (2004)
Brasey, T, Buryak, A, Scopelliti, R, Severin, K
The reaction of [ReBr3(CO)(3)][NEt4](2) with 3-hydroxy-1,2,3-benzotriazine-4 (3 H) -one in the presence of base gave the ionic rhenium complex [ReBr(C7H4N3O2)(CO)(3)][NEt4] (2) which was...
New catalysts and receptors by self-assembly and combinatorial chemistry (2004)
New methods that allow the generation of transition metal-based catalysts and receptors are discussed. It is shown that heterobimetallic, halogeno-bridged complexes are well-suited for screening...
Self-assembled organometallic receptors for small ions (2003)
Trinuclear metallamacrocycles can be obtained by reactions of (arene)Ru, Cp*Rh and Cp*Ir complexes with pyridonate ligands. Using 3-oxy-pyridonate as the bridging ligand, organometallic analogues of...
Electronic effects in 12-metallacrown-3 complexes. A theoretical and experimental study (2003)
Lehaire, ML, Schulz, A, Scopelliti, R, Severin, K
The Mulliken charges of the 12-metallacrown-3 complex [(C6H6)Ru(C5H3NO2)](3) were determined by a single point analysis at the HF level. For comparison, a Mulliken population analysis was carried out...
A chloro-bridged (arene)Ru complex with a polymerizable side chain (2003)
Wendicke, SB, Burri, E, Scopelliti, R, Severin, K
An [(arene)RuCl2](2) complex with a methacrylate side chain (2) has been prepared in two steps using commercially available starting materials. This complex reacts with PPh3, pyridine, or toluidine...
Stabilization of molecular LiF, LiFHF, and Na2SiF6 using metallamacrocyclic hosts (2003)
The molecular forms of LiF, LiFHF and Na2SiF6 have been stabilized using trinuclear metallamacrocyclic complexes of (cymene)Ru-II, (Cp*)Rh-III and (Cp*)Ir-III as specific receptors. The host-guest...
Stabilization of molecular LiF and LiFHF inside metallamacrocyclic hosts (2002)
Lehaire, ML, Scopelliti, R, Severin, K
Complexes of molecular LiF and LiFHF were synthesized using the metallamacrocyclic receptors [(cymene)Ru-(C5H3NO2)](3) (1), [(CpRh)-Rh-*(C5H3NO2)](3) (2), and [(CpIr)-Ir-*(C5H3NO2)](3) (3). LiBF4...
A self-assembled, redox-responsive receptor for the selective extraction of LiCl from water (2002)
There is considerable interest in synthetic ionophores with high affinity and selectivity for Li+. But so far, compounds that selectively bind Li+ in the presence of other alkali and alkaline earth...
Asymmetric halogeno-bridged complexes: New reagents in organometallic synthesis and catalysis (2002)
Several methods to synthesize bimetallic complexes in which two different metal fragments are connected by halide bridges are described. Using simple starting materials a large pool of structurally...
Encapsulation of molecular Na2SiF6 by two metallacrown complexes (2002)
Lehaire, ML, Scopelliti, R, Severin, K
A complex of molecular Na2SiF6, stabilised by two 12-metallacrown-3 host complexes, has been synthesised and characterised by single crystal X-ray diffraction.
A ruthenium porphyrin catalyst immobilized in a highly cross-linked polymer (2001)
[GRAPHICS] An immobilized Ru(meso-tetraarylporphyrin) complex was shown to be a very efficient catalyst for the epoxidation of olefins. In the presence of HBr, alcohols and even alkanes could be...
Self-assembled organometallic [12]metallacrown-3 complexes (2001)
Piotrowski, H, Hilt, G, Schulz, A, Mayer, P, Polborn, K, Severin, K
The reaction of [(arene)RuCl2](2) (arene = C6H6 cymene, C6H3Et3, or C6Me6) or [Cp*RhCl2](2) with 3-hydroxy-2-pyridone in the presence of Cs2CO3 gives trinuclear metallamacro-cyclic complexes. The...
Piotrowski, H., Polborn, K., Hilt, G., Severin, K.
The prepn. of redox-responsive metallomacrocyclic ionophore I, which is easily obtained by the reaction of [(cymene)RuCl2]2 with 3-hydroxy-2-pyridone in the presence of Cs2CO3 or K2CO3, is described....
A Synthetic Peptide Ligase. Mechanistic Investigations (2001)
Kennan, A. J., Severin, K., Ghadiri, M. R.
A 33-residue de novo designed peptide ligase is reported which catalyzes the template-directed condensation of suitably activated short peptides with catalytic efficiencies in excess of 105...
Da Silva, A. C., Piotrowski, H., Mayer, P., Polborn, K., Severin, K.
Homo- and heterobimetallic complexes, in which half-sandwich complexes of ruthenium(II), rhodium(III), and iridium(III) are connected via three chloro bridges to RuCl2(PPh3)2, have been synthesized....
A Self-Replicating Peptide (1996)
Lee, D. H., Granja, J. R., Martinez, J. A., Severin, K., Ghadiri, M. R.
Macrocyclic Titanium(IV) Complexes with C3-symmetric synthetic Peptides (1995)
Severin, K., Beck, W., Trojandt, G., Polborn, K., Steglich, W.