SMARTS atomic weight

Table 8.2 Atomic Weights for Some Common Atoms and Associated SMARTS...

This function computes the average molecular weight of an input SMILES structure. It uses the table of atomic weights and SMARTS shown in Table A.2. It relies on the count matches function described in Chapter 7. 

While the amount of electricity that can be conducted by polymer films and wires is limited, on a weight basis the conductivity is comparable with that of copper. These polymeric conductors are lighter, some are more flexible, and they can be laid down in wires that approach being one-atom thick. They are being used as cathodes and solid electrolytes in batteries, and potential uses include in fuel cells, smart windows, nonlinear optical materials, LEDs, conductive coatings, sensors, electronic displays, and in electromagnetic shielding. 

The simplest molecular property is molecular weight. The obvious fragments to use for this are atoms. It is a simple matter to define the SMARTS fragments for any atom. Table 8.2 shows the definition for a few common atoms. The full table for the first 103 atoms is shown in the Appendix. 

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