Drawing large molecules from scratch in usually not a good idea.

Best to use experimental xray structures of similar systems and for this best to use CCDC database. Searching through it requires a license (ask your university or crystaloography unit if they have one), but you can also find a paper where the structure was first solved and then request the .cif file for free at ccdc.cam.ac.uk/getstructures (gaussview reads .cif files or you can translate it to .mol2 / .xyz / .mol using openbabel).

Dear Professor Bartosz Trzaskowski,

Thank you very much for your kind response. In a metal complex containing Platinum what are the values of charge and multiplicity that should be used for optimization in Gaussian09

Regards

Renjith Raveendran Pillai

Dear Renjith,

Charge and multiplicity of the complex depend upon the nature of ligands. Please mentioned the ligands so that we may help you out.

Regards

If you mention what metal complex you've to draw, we may able to help. If the structure is moderately big, it is still possible to draw it in Gview.

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