Why is the carbon-carbon triple bound for potassium phenylethynyltrifluoroborate is not showing in carbon-13 spectrum?

Hi friends, I have carbon -13 NMR for potassium phenylethynyltrifluoroborate (PhCCBF3K) ,using  600MHZ,the carbon-carbon triple bonded were not showing in the spectrum can any one know, or...

11 December 2015 8,861 4 View