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Single helical [CuIL]ClO4·½CH2Cl2 (L = 1∶2 condensate of benzil dihydrazone and 2-acetylpyridine) unfolds and coils up in CH2Cl2 solution to generate double helical [CuI2L2]2+.
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Chowdhury et al. (2002) studied this question.
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