Critical cation balance in B → Z transition: role of Li +
1983; Wiley; Volume: 164; Issue: 1 Linguagem: Inglês
10.1016/0014-5793(83)80013-1
ISSN1873-3468
AutoresN. Ramesh, Samir K. Brahmachari,
Tópico(s)Advanced Battery Materials and Technologies
ResumoThe sodium salt of poly(dG‐dC) is known to exhibit a B → Z transition in the presence of various cations and 60% alcohol. We here show that the lithium salt of poly(dG‐dC) does not undergo B → Z transition in the presence of 60% alcohol since Li + with its large hydration shell cannot stabilize the Z‐form. On the other hand, high concentrations of Mg 2+ or micromolar concentrations of the cobalt hexamine complex which are known to stabilize the Z‐form can compete with Li + for charge neutralization and hence bring about a B → Z transition in the same polymer. From the model building studies the mode of action of the cobalt—hexamine complex in stabilizing the Z‐form is postulated.
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