Search results for "molecule"

Hybrid Materials Formed by Two Molecular Networks. Towards Multiproperty Materials

1999

Abstract The possibilities offered by hybrid materials formed by two molecular networks in the context of the molecular magnets are illustrated. Molecule-based layered magnets are used as anionic hosts for electroactive molecules, with the aim of obtaining multiproperty materials exhibiting in addition to the cooperative magnetism other interesting properties according to the nature of the inserted molecules. In particular, hybrid molecular compounds containing molecular species giving rise to paramagnetic, conducting, or bi-stable properties are reported.

The inherent structural instability: concentration-dependent transformation of pyrogallarene to pyrogallarene lactones.

2011

Pyrogallarene shows concentration-dependent instability in dilute solutions resulting in elimination of two ketene molecules and formation of pyrogallarene lactones. This unexpected phenomenon, which is not observed with resorcinarenes, highlights the significance of the four hydroxyl groups at 2-position for the molecular characteristics of pyrogallarenes.

Rational linkage of magnetic molecules using click chemistry

2015

Established CuAAC click reactions are used for the first time to assemble magnetic molecules to an extended molecular arrangement. This novel synthetic approach is expected to be a general approach to link SMMs as an important precondition to realize quantum computing.

Tetrathiafulvalene-based molecular nanowires.

2008

A new molecular wire suitably functionalized with sulfur atoms at terminal positions and endowed with a central redox active TTF unit has been synthesized and inserted within two atomic-sized Au electrodes; electrical transport measurements have been performed in STM and MCBJ set-ups in a liquid environment and reveal conductance values around 10(-2) G0 for a single molecule.

Steering molecular island morphology on an insulator surface by exploiting sequential deposition

2011

Depending on the deposition order in coadsorption of C(60) and SubPc molecules on CaF(2) (111), distinctly different island morphologies can be obtained. We demonstrate that non-equilibrium processes can play a significant role in molecular structure formation and constitute a new route for complex molecular patterning of an insulating surface.

Rotational spectrum and equilibrium structure of silanethione, H2SiS

2008

Unsubstituted silanethione, H(2)Si=S, has been characterized experimentally for the first time by means of rotational spectroscopy; the equilibrium structure of this fundamental molecule has been evaluated through a combination of experimental data from a total of ten isotopologues and results of high-level coupled-cluster calculations.

Semiempirical calculations on the interaction between dimethyltin(IV) and DNA model system

1999

Abstract The interaction between a dinucleotide triphosphate duplex (DD), mimicking the DNA molecule, and the dimethyltin(IV) cation is studied by the semiempirical PM3 method. The results show that the interaction can occur involving the tin atom and the electron-donor centres of DD, requiring in some cases the presence of water molecules. In particular, the binding of the dimethyltin(IV) moiety with two adjacent phosphate oxygen atoms is allowed by the presence of water molecules coordinating to the tin atom. In this case the tin environment shows a geometry in agreement with 119 Sn Mossbauer and X-ray data.

Negative ions and their importance for the analysis of residual gas

1963

Abstract In the case of heavy molecules, mass spectre obtained with the help of positive ions generally lead to the recording of fragments only, and thus do not indicate the true original mass. In order to overcome this drawback, an attempt was made to attach slow electrons to heavy molecules, since less dissociation products are expected with spectre produced by negative ions. As a preliminary experiment, a simple and cheap form of ion source was constructed which produces mainly atomic negative ions.

ChemInform Abstract: Glycopeptides as Signal Molecules. A Synthetic Challenge on Its Way Towards Interdisciplinary Application

2010

ChemInform Abstract: Renaissance of Electrosynthetic Methods for the Construction of Complex Molecules

2014

Current affairs: Efficient N,N dimerization by using an electric current is a recent powerful example of preparative electrosynthesis where conventional reagents fail. The general and practical nature of this method as well as other applications will breathe new life into the electroorganic synthesis of complex molecules.