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    STUDIA CHEMIA - Issue no. 2 / 2003  

  Abstract:  Nanotube tiling can be modified, from the polyhex [6] to [4, 8] and [5, 7] coverings, by following various routes for the well-known Stone-Wales SW edge rotation. The interchanging of Z[6] to A[6] and vice-versa is, for the first time, shown to proceed via an R[4, 8] intermediate, by SW isomerization. A new ôazulenic" [5, 6, 7] covering is proposed. Isomerization routes are given in terms of edge-rotating operators, i.e., lattice row-column numbers associated to the edge endpoints of the repeat units in the parent net.  
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