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OK they looked similar in your pictures Maybe you have two different crystal forms Phil On 30 Dec 2014, at 16:56, "<Thii Chand>" <[log in to unmask]> wrote: > Dear Dr.Evans, > > Thanks for your reply. > > The unit cell parameters are a=140 , b=110, c=44., Hence i am afraid, the interchange couldn't have occurred due to similar a and b. I had performed dehydration using PEG in the said case. I agree that dehydration or soaking with ligand can hardly lead to the interchange of axis.But, what i find difficult to understand is how come only in three out of nice structures,interchange of cell axis occurs, where i had maintained similar experimental conditions for all the nine cases. Is there any logical explanation for this or am i doing something wrong? > > The sp group are P21212 in all the cases. > > Thanks in advance > > Regards, > T.chandran