I am trying to optimize a hexa-coordinated Cu-complex with N2O(N=N=O) as one of the ligand. My input file parameters are define below. Can anyone help me how to solve the problem?

N.B:- When I optimize the same Cu-complex without N2O(N=N=O) i.e- a penta-coordinated Cu-complex, it ends with normal termination .

%mem=2500MB

%chk=cu_complex.chk

# opt=maxcycles=500 b3lyp/3-21g scrf=(solvent=dichloromethane)

geom=connectivity

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