Molecular bridge

The joining of particles by polymers as part of the process of flocculation. Usually higher MW polymers produce higher levels of molecular bridging. 

Chiorboli C, Indelli MT, Scandola F (2005) Photoinduced Electron/Energy Transfer Across Molecular Bridges in Binudear Metal Complexes. 257 63-102 Coleman AW, Perret F, Moussa A, Dupin M, Guo Y, Perron H (2007) Calix[n]arenes as Protein Sensors. 277 31-88... 

D-B-A Donor-molecular bridge-acceptor supramolecular system... 

Fig. 4 Schematic representation of (1) the energy of electron donor (D) or electron acceptor (A) units (regardless as to whether molecules or electrodes), (2) the HOMO and LUMO molecular orbitals, and (3) the energy gap AE between D/A and the molecular orbitals, (a) AE is changed by changing the electronic structure of the molecular bridge, (b) AE is changed by changing the energy levels of the donor or acceptor units...

In addition and importantly, even in non-active junctions, when the electrode Fermi level matches the molecular bridge energy levels, resonance phenomena can generate electrical behaviours similar to those of conventional electronic devices, such as rectification [86-89] and negative differential resistance (NDR) [90, 91]. 

Fig. 11 The scattering properties of a five branches - four electrodes molecular bridge, (a) Detailed atomic structure of the molecule. A central perylene branch was included to mimic an internal measurement branch, (b) EHMO-ESQC calculated T12(E) transmission coefficient (plain) and predicted T12(E) transmission coefficient (dashed), applying the intramolecular circuit rules discussed for the four molecular fragments given in Fig. 12. The dashed (dotted) line is the Ti2(E) variation for the single molecular branch, as presented in the inset, to show the origin of the destructive interference...

The molecular bridge is still balanced for Rg = Rx. But, as presented in Fig. 21, the variations of 7W as a function of Rg are different with our new circuit rules, as compared to that given by the Kirch off laws. Furthermore, the conformational variations used to balance the bridge do not permit to explore values of Rg below the planar conformation. This restricts the exploration of the possible 7W intensity as presented in Fig. 21. 

Chiorboli C, Indelli MT, Scandola F (2005) Photoinduced Electron/Energy Transfer Across Molecular Bridges in Binuclear Metal Complexes. 257 63-102 Collin J-P, Heitz V, Sauvage J-P (2005) Transition-Metal-Complexed Catenanes and Rotax-anes in Motion Towards Molecular Machines. 262 29-62 Collyer SD, see Davis F (2005) 255 97-124 Commeyras A, see Pascal R (2005) 259 69-122 Correia JDG, see Santos I (2005) 252 45-84 Costanzo G, see Saladino R (2005) 259 29-68 Credi A, see Balzani V (2005) 262 1-27 Crestini C, see Saladino R (2005) 259 29-68... 

Saffarzadeh A (2008) Electronic transport through a Cgo molecular bridge the role of single and multiple contacts. J Appl Phys 103 083705-083706... 

Mishra S (2005) Quantum transport through a Cgo-X molecular bridge with the extra atom at the center. Phys Rev B 72 075421... 

Novak JP, Nickerson C, Franzen S, Feldheim DL (2001) Purification of molecularly bridged metal nanoparticle arrays by centrifugation and size exclusion chromatography. Anal Chem 73 5758-5761... 

McConnell WP et al. (2000) Electronic and Optical Properties of Chemically Modified Metal Nanoparticles and Molecularly Bridged Nanoparticle Arrays. J Phys Chem B 104 8925-8930... 

Electron transfer through a molecular bridge can occur by single or multiple-step mechanisms [5-7]. The multiple steps may involve real (hopping) or virtual (superexchange) bridging states. Single electron transfer steps... 

Preparation and chemical and photophysical properties of size-quantized HgS/CdS particles were reported [83, 84], Single-crystal germanium quantum wires [85], CdTe [86], and HgTe [86] were prepared in solution. Size and monodispersity control of ultrasmall CdS particles were achieved by thiol capping [87] and by size selective precipitation [88]. Preparation, TEM, and X-ray scattering analysis of a glassy network of CdSe nanocrystallites connected by molecular bridges were reported [89]. 

In order to realize, in practice, the coupling effects of silanes, it is necessary to standardize the conditions of application such that the silane is able to provide a molecular bridge without itself becoming a weak interphase between the fiber and matrix. As already mentioned, the principal experimental parameters to be controlled in the application of silane coupling agents on the fibers are the concentration, the solvent, and the treatment time. In order to arrive at the best conditions for each parameter, the IFSS was determined for each set of treatment conditions. Optimization of the conditions of silane application was thus progressively achieved. 

Possible Role of Long-Range VDW Forces Between Cell Membrane Surfaces. The above discussion has been based on the model of macro-molecular bridging, and the Eb is caused by the interaction between the bridging macromolecule and the cell surface. Recent theoretical and experimental studies (41,42) have shown that VDW attractive forces can be exerted between cell surfaces over distances in the range found in RBC rouleaux. 

A simplified model may still be developed from eq.(34). As the bias voltage E is increased, one of the denominators tends to zero and consequently A to infinity. The model does not hold close to an orbital energy of the bridge and the molecular bridge must be... 

Undoubtedly the factors suggested by Gielen and Nasielski are important nucleophilic co-ordination of solvent to tin is probably the reason why compound (X) suffers restricted rotation in solvent carbon tetrachloride (when the intra-molecularly-bridged species (Xa) is present) but not in solvents such as alcohols, ethers, or pyridine/carbon tetrachloride (when the species present is now (Xb), with the tin atom five-co-ordinate through external coordination)54. ... 

Chiorboli C, Indelli MT, Scandola F (2005) Photoinduced Electron/Energy Transfer Across Molecular Bridges in Binuclear Metal Complexes. 257 63-102... 

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