Abstract
Two Cd(II) coordination compounds, i.e. [Cd(HL)(phen)2(H2O)]·HL·3H2O (1) and {[Cd(HMeL)2(4,4′-bipy)(H2O)]·H2O}n (2) and (where HL = N-carboxymethyl-N-phenyliminoacetato, HMeL = N-carboxymethyl-N-(m-methylphenyl)iminoacetato, 4,4′-bipy = 4,4′-bipyridine and phen = phenanthroline) have been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction methods. The photoluminescence properties and mechanisms, studied by means of solid state absorption, excitation/emission spectra, time-resolved lifetime techniques, and density functional theory (DFT) calculations, indicate that the emissions of both compounds originate from a combination of exciplex and charge-transfer complex. Interestingly, both compounds exhibit excitation-dependent emissions, which can be used to fine-tune their emission wavelengths.
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