H1 NMR Spectra of inorganic complex, Cu4OCl6(2-mepy)4

I'm having difficult interpreting the following H1 NMR I have been given for Cu4OCl6(2-mepy)4. 


[![enter image description here](https://i.stack.imgur.com/dO5kR.jpg)](https://i.stack.imgur.com/dO5kR.jpg)


The NMR spectra obtained with integration trace beneath. I'm not too sure how to rationalise the 4.5:1 ratio between the peaks nor the cause of the small broad peak at 115ppm (well to the left of the spectra).


[![enter image description here](https://i.stack.imgur.com/o4Mqq.jpg)](https://i.stack.imgur.com/o4Mqq.jpg)


I'm also not too sure why the H1 NMR range is so vast. I appreciate being bonded to metals the electron density is changed across the relevant proton environments but by that much?


Thanks a lot




What you have there is a typical example of an H NMR spectrum of a paramagnetic compound. The formal oxidation state of the Cu here is Cu(II) resulting in d9 configuration. This means that there will be an unpaired d electron making the Cu atoms paramagnetic.


The lone electron in the Cu atoms disturbs the magnetic field the Hs' feel resulting in extreme chemical shifts and also provide a very efficient relaxation mechanism resulting in extreme peak broadening (in some cases you cant even see the resonances at all). The highest paramagnetic shift I have encountered so far was around 250 ppm for an Fe(II) complex I made. In another occasion we had resonances at 1200 ppm!


As for the peak broadening I had peaks of ν1/2 of a few thousands of Hz. The integration wont always make much sense with paramagnetic compounds either. 


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