Basis sets that can be used for macrocyclic complexes What could be the possible basis set that can be used for a metal base macrocyclic complex in gaussian09? 

I am using transition metals such as $\ce{Ni}$, $\ce{Co}$, etc.  Also, I have tried using DFT and HF theory for optimization but I am not getting appropriate results.

I am basically looking for binding of metal with the ligand in these coordinate complexes on basis of which i can use them for a particular application.
The basis set that I am using right now for DFT is Opt=(Cartesian,maxcycles=500)  b3lyp/gen  nosymm   pseudo=read SCF=(conver=5,vshift=400,maxcycles=1000)

Edit: Earlier I was using a specific basis set for transition metals and now I am using lanl2 as a single basis set for the DFT calculation. I am also using hf cal in which the sto3g basis set is used but iam getting two consistent errors in optimization which are convergence failure and number of step exceed error processed link 9999.
In order to check on the availability of basis sets you may want to look at the Basis Set Exchange. After determining which basis set suits your problem (this will likely involve some literature search, Nickel, DFT, basis set, in Web of Science should do the trick), you can enter basis sets into Gaussian using the Gen keyword. BSE will export any selected basis sets in Gaussian format, so that shouldn't be a problem.