Cu4I4 cubane-type secondary building units are reticulated with a piperazine linker at room temperature to crystallize the metal-organic frameworks (MOFs) Cu4I4(Pip)2 in a non-centrosymmetric P6222 space group. For the first time, cubane cluster type MOF's strong piezoelectric nature has been studied by switching spectroscopy piezo force microscopy (SS-PFM) and piezo force microscopy (PFM) mapping of the crystal, with piezoelectric constant (d33) similar to 52.33 pm V-1, highlighting its potential for mechanical energy harvesting processes.
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