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6 results on '"Limburg B"'

1. Long-lived charged states of single porphyrin-tape junctions under ambient conditions

Author

Leary, Edmund, Kastlunger G., Limburg B., Rincón-García L., Hurtado-Gallego J., González, Teresa, Bollinger G.R., Agraït, Nicolás, Higgins S.J., Anderson H.L., Stadler R., Nichols R.J., Leary, Edmund, Kastlunger G., Limburg B., Rincón-García L., Hurtado-Gallego J., González, Teresa, Bollinger G.R., Agraït, Nicolás, Higgins S.J., Anderson H.L., Stadler R., and Nichols R.J.

Published
2021

2. Ruthenium-decorated lipid vesicles: light-induced release of [Ru(terpy)(bpy)(oh2)]2+ and thermal back coordination

Author

Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., Killian, J.A., Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., and Killian, J.A.

Abstract

Electrostatic forces play an important role in the interaction between large transition metal complexes and lipid bilayers. In this work, a thioether-cholestanol hybrid ligand (4) was synthesized, which coordinates to ruthenium(II) via its sulfur atom and intercalates into lipid bilayers via its apolar tail. By mixing its ruthenium complex [Ru(terpy)(bpy)(4)]2+ (terpy = 2,2′;6′,2′′-terpyridine; bpy = 2,2′-bipyridine) with either the negatively charged lipid dimyristoylphosphatidylglycerol (DMPG) or with the zwitterionic lipid dimyristoylphosphatidylcholine (DMPC), large unilamellar vesicles decorated with ruthenium polypyridyl complexes are formed. Upon visible light irradiation the ruthenium−sulfur coordination bond is selectively broken, releasing the ruthenium fragment as the free aqua complex [Ru(terpy)(bpy)(OH2)]2+. The photochemical quantum yield under blue light irradiation (452 nm) is 0.0074(8) for DMPG vesicles and 0.0073(8) for DMPC vesicles (at 25 °C), which is not significantly different from similar homogeneous systems. Dynamic light scattering and cryo-TEM pictures show that the size and shape of the vesicles are not perturbed by light irradiation. Depending on the charge of the lipids, the cationic aqua complex either strongly interacts with the membrane (DMPG) or diffuses away from it (DMPC). Back coordination of [Ru(terpy)(bpy)(OH2)]2+ to the thioether-decorated vesicles takes place only at DMPG bilayers with high ligand concentrations (25 mol %) and elevated temperatures (70 °C). During this process, partial vesicle fusion was also observed. We discuss the potential of such ruthenium-decorated vesicles in the context of light-controlled molecular motion and light-triggered drug delivery.

Published
2011

3. Ruthenium-decorated lipid vesicles: light-induced release of [Ru(terpy)(bpy)(oh2)]2+ and thermal back coordination

Author

Biochemistry of membranes, Inorganic Chemistry and Catalysis, Organic Chemistry and Catalysis, Sub Chem Biol & Organic Chem begr 1-6-12, Sub Inorganic Chemistry and Catalysis, Sub Biochemistry of Membranes begr1-6-12, Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., Killian, J.A., Biochemistry of membranes, Inorganic Chemistry and Catalysis, Organic Chemistry and Catalysis, Sub Chem Biol & Organic Chem begr 1-6-12, Sub Inorganic Chemistry and Catalysis, Sub Biochemistry of Membranes begr1-6-12, Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., and Killian, J.A.

Published
2011

4. Ruthenium-decorated lipid vesicles: light-induced release of [Ru(terpy)(bpy)(oh2)]2+ and thermal back coordination

Author

Biochemistry of membranes, Inorganic Chemistry and Catalysis, Organic Chemistry and Catalysis, Sub Chem Biol & Organic Chem begr 1-6-12, Sub Inorganic Chemistry and Catalysis, Sub Biochemistry of Membranes begr1-6-12, Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., Killian, J.A., Biochemistry of membranes, Inorganic Chemistry and Catalysis, Organic Chemistry and Catalysis, Sub Chem Biol & Organic Chem begr 1-6-12, Sub Inorganic Chemistry and Catalysis, Sub Biochemistry of Membranes begr1-6-12, Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., and Killian, J.A.

Published
2011

5. Ruthenium-decorated lipid vesicles: light-induced release of [Ru(terpy)(bpy)(oh2)]2+ and thermal back coordination

Author

Biochemistry of membranes, Inorganic Chemistry and Catalysis, Organic Chemistry and Catalysis, Sub Chem Biol & Organic Chem begr 1-6-12, Sub Inorganic Chemistry and Catalysis, Sub Biochemistry of Membranes begr1-6-12, Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., Killian, J.A., Biochemistry of membranes, Inorganic Chemistry and Catalysis, Organic Chemistry and Catalysis, Sub Chem Biol & Organic Chem begr 1-6-12, Sub Inorganic Chemistry and Catalysis, Sub Biochemistry of Membranes begr1-6-12, Bonnet, S.A., Limburg, B., Meeldijk, J.D., Klein Gebbink, R.J.M., and Killian, J.A.

Published
2011

6. Brilliant x-ray radiation from a low emittance 855 MeV electron beam

Author

Naval Postgraduate School (U.S.), Physics, Backe, H., Brenzinger, K.-H., Buskirk, P., Dambach, S., Euteneuer, H., Gampert, S., Hartmann, H., Hagenbuck, F., Herberg, C., Ihm, M.O., Johann, K., Kaiser, K.H., Knies, G., Kube, G., Lauth, W., Limburg, B., Schope, H., Stephan, G., Walcher, Th., Zahn, R., Naval Postgraduate School (U.S.), Physics, Backe, H., Brenzinger, K.-H., Buskirk, P., Dambach, S., Euteneuer, H., Gampert, S., Hartmann, H., Hagenbuck, F., Herberg, C., Ihm, M.O., Johann, K., Kaiser, K.H., Knies, G., Kube, G., Lauth, W., Limburg, B., Schope, H., Stephan, G., Walcher, Th., and Zahn, R.

Abstract

Electron storage rings as synchrotron radiation sources are presently the most powerful x-ray sources in the energy range between 0.53 keV, the "water window" for microscopy of biological molecules, and 33.16 keV, the K-edge of iodine for a possible coronary angiography. However, with the advent of modern electron accelerators delivering high current low emittance electron beams with energies up to a few GeV it was realized that they may present also attractive sources of intense x rays. In this contribution we report on the investigation of resonant transition radiation in the x-ray region (XTR), and parametric x-ray radiation (PXR) as such x-ray sources. The experiments have been performed with the low emittance (3 it nm rad) 855 MeV electron beam of the Mainz Microtron MAMI....

Published
1995

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