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Although the flexibility around the etheric O atom leads to the formation of a 1D helical chain structure, the entire 3D architecture of complex 4 is achiral owing
to the phenomenon that the left-handed screws (L-helix) and the right-handed ones (R-helix) arrange alternatively in the ac plane linked by C¨CH ¡¤¡¤¡¤O hydrogen bonding interactions between the C10 atom from the phen ligand and O1W from the coordinated water molecules with a C ¡¤¡¤¡¤O distance of 3.060(6) A˚

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