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The interaction between alkali (Li + , Na + , K + ) and alkaline earth (Be 2+ , Mg 2+ , Ca 2+ ) metal cations with G and SG-tetrads were studied using ab initio and density functional theory methods. The calculations reveal that cation-G and SG-tetrad complexes adopt normal four-stranded Hoogsteen bonded structures. The substitution of different cations...
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