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In contrast to the reported open-shell zigzag [6]n cyclacenes and short nanotubes (n=5−10), their analogues which contain alternating Ge-C bonds, appear with unstable singlet open-shell (Sos) electronic ground states, at unrestricted broken spin-symmetry B3LYP and BPW91 levels of theory (n=the number of fused benzenoid rings). We have boosted their stability by implementing altering Ge-C bonds that...
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