Molecular tailoring

Much research work has been done and continues to be done on the development of new dyes for this outlet. For instance, Avecia have a range of yellow magenta and cyan dyes, based on the ammonium salt principle above, which do show improved wet fastness properties. An alternative approach adopted by workers at Ilford, based on their experience in colour photography, involves the molecular tailoring and formulation of dyes which aggregate and hence have light fasmess properties nearer to pigments (Archiva Inks). 

Surface science has been one of the first beneficiaries of self-assembled nanostructures (in the form of SAMs). Self-assembly is a very general strategy for forming molecularly tailored interfaces, and, other than the few systems that have formed the basis for the majority of work in SAMs, almost none of the obvious opportunities to use self-assembly to build ordered, nanostructured interfaces have been examined. The preparation of more sophisticated structures based on molecules with complex stmctures, on self-assembled colloids, on multilayered polymers formed by electrostatic interactions between charged groups166,167, or on biologically derived structures is just beginning168-171. 

Molecular tailoring of organometallic polymers for efficient catalytic CO2 reduction mode of formation of the active species... 

T. Seki, M. Sakuragi, Y. Kawanishi, Y. Suzuki, T. Tamaki, R. Fukuda, and K. Ichimura, Command surface of Langmuir-Blodgett films. Photoregulation of liquid crystal alignment by molecularly tailored surface azobenzene layers, Langmuir 9, 211-218 (1993). 

M. M. Deshmukh, L. J. Bartolotti, and S. R. Gadre, Intramolecular hydrogen bonding and cooperative interactions in carbohydrates via the molecular tailoring approach, J. Phys. Chem. A, 112 (2008) 312-321. 

This concept of molecular tailoring to introduce units giving the required mechanical and physical properties has led to the provision of a variety of linear and branched polyesters and polyethers for polyurethane production. These intermediates may have molecular weights of the order of 500-3000, be crystalline or amorphous, contain atoms or groups which contribute to molecular flexibility or stiffness, and be linear or branched according to the requirements for use in elastomers, flexible or rigid foams, coatings, etc. 

Aliphatic polyketones are still in an early phase of product development and at present, only terpolymers based on CO, ethene, and propene are in a well-enough advanced state of development for use as engineering thermoplastics. Future research into the structure-performance relationships of co- and terpolymers based on these and other olefinic monomers will lead to a controlled molecular tailoring and designing of polymers with desired properties. 

The azide photosensitisers used in negative resists show good thermal stability and readily decompose with high efficiency on irradiation. Whilst individual azides have relatively narrow absorption bands (Fig. 7.8), molecular tailoring allows a range of compounds to be... 

Molecular tailoring of tnidcrials with fast switching times for ekctrooptic applications. 

---