I have group 4 complexes with one ligand one metal and two iso-propoxide units. When I used these complexes for ROP (ring-opening polymerization) of rac-lactide, with some complexes Mn I achieved near like theoretical Mn and some other complexes I achieved more than theoretical Mn. Some of the cases I got less than theoretical Mn also.
So, how can I conform whether two iso-propoxide units initiated the polymerization or one iso-propoxide unit involved.
From proton NMR may be possible but this iso-propoxide unit peak is overlapped with polymer peak and some times not visible also because of high monomer ratio.
From GPC by observing Mn is it possible??
From MALDI we can get any information regarding how many active sites??
If you have any reference articles please suggest me.
Thank you in advance.
Kind regards,
Sreenath Pappuru.
Hello dear, if the peak is overlopping you can mak a modification od the sample and make determination or by using acoplated NMR also you can do the determination .
Dr. Edwin. Many thanks for your answer.
What is acoplated NMR?
Modification of the sample means by adding external standard??
Thank you,
Sreenath.
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