Molecular electronics poly

A particularly interesting example is the synthesis of alkyne-bridged oligomers and polymers, which are attractive materials for optical and electronic applications. Bunz and coworkers were able to modify the Mortreux catalyst system [Mo(CO)6 and a suitable phenol]11 and reaction conditions to perform acyclic alkyne metathesis of 1,4-dipropynylated benzenes to produce high-molecular-weight poly(p-... 

The field of molecular electronics may be considered to encompass much more than molecular electronic devices. In its broadest context, molecular electronics may be regarded as simply the application of molecules, primarily organic molecules, to electronics. This definition would include such areas as liquid crystalline materials, piezoelectric materials such as poly(vinylidine fluoride), chemically sensitive field-eflFect transistors (CHEMFET), and the whole range of electroactive polymers. These applications are beyond the scope of this book and are covered in other reviews 34, 33). However, given the basic tenet of molecular electronics, namely, the ability to engineer and assemble molecular structures into a useful device, the broader definition raises the question of whether organic molecules can be specifically assembled or engineered for unique applications in electronics. 

These substituent descriptors are usually used in - Hansch analysis as molecular electronic properties in the case of a mono-substituted series of compounds, while they are summed over all the molecule substituents to obtain global molecular descriptors in the general case of poly-substituted compounds. 

The rate constant of the electron-transfer step was Increased several times for the catalyst (1). This agreed with the result that 1 acted as an effective catalyst for the oxidative pol)rmer-ization of dimethylphenol to yield high molecular weight poly-(phenylene oxide) (7). 

Despite the fact that HF or Kohn- CF equations provide in principle the complete set of electronic orbitals that describe the multi-electronic-poly center bonds, Iheir main drawback is that of providing the delocalized description over an entire molecular space. Such an analysis has to be accomplished with special techniques through which the localized orbitals and localized chemical bond are to be recovered (Putz Chiriac, 2008 Putz, 2009). Only this way can quantum mechanics provide a viable rationale, i.e., quantum chemistry, in chemical bond characterization. Nevertheless, such a rationale can be achieved in two ways one of them involves the orbital transformation producing the localized set of orbitals and indices (Daudel et al., 1983) the other one, based on electronic density, includes the electronic density, to a certain degree, into an electronic localization super) function 11 1 so as to generate a local, analytical indication of the electronic pair of the chemical bond (Becke Edgecombe, 1990 Schmidera Becke, 2002 Berski et al, 2003 Kohout et al., 2004 Nesbet, 2002 Putz, 2005). 

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