I constructed an input file of metal ion bound probe. I added all the co-ordinate bonds as single bond and run the input file in Gaussian. But, in the output file, I got a structure where all the co-ordinate bonds (given as single bond in input file) became vanished. Is it OK? Or need any correction? What are the corrections?
That have been said many times, but there are no bonds in quantum chemistry, hence there are no bonds in gaussian input/output. Simply, your visualization program draws a bond between atoms if they are closer than a certain distance (defined in this program) and doesn't draw them, if they are further from each other. That does not mean that there is/isn't a "bond".
To get any info about bonds you should do e.g. NBO analysis in gaussian or something similar or just use standard criteria of lenghts for bonds.
YES, when the bonds are a bit long, visualization software like the gaussview does not represent them. You have to redesign them;
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