Tetranuclear copper(i) carboxylates: the effect of a stepwise increase in Lewis acidity on solid-state structures and photoluminescenceElectronic supplementary information (ESI) available: IR, X-ray powder diffraction details, additional thermal ellipsoid plots of the structures. CCDC reference numbers 817555–817557. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c1dt10848d - Oleksandr Hietsoi; Alexander S. Filatov; Cristina Dubceac; Marina A. Petrukhina (Dalton Transactions: An International Journal of Inorganic Chemistry, 2011)