We have observed a decreasing intensity in the absorbance and emission spectrum of an inorganic complex with the increase in the amount of water (probably coordinating) in the system. There is no change in the peak positions.
What kind of spectrum, UV-Vis-NIR or IR? Can you show us a spectrum so that we know of which signal/band you speak?
Ok, then things are clear. Due to the increase of water the concentration of your complex decreases and thereby the signal. According to Beer's law this decrease should be proportional to the decrease in concentration. If this is the case for your samples, you can safely assume that the oscillator strength stays the same, it is just the number of oscillators per unit volume that is changed. Nevertheless, it seems to me that there are some smaller band shifts and changes of relative intensity, so there is some interaction with the water imho.
Thank you for your answer. However, there might not be a decrease in concentration of the complex. We think that the water is probably replacing the organic solvent partially. But we will check again as to the concentration dependence.
Ok, so water is not the primary solvent. Is it a solvent at all or bound in form of water of crystallization? What is your solvent then, ethanol?
most of the solvent (DMF) is in the bound form, forming a gel. Then we start adding water gradually. As more and more water is added relative to DMF, we get the decrease in intensity.
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