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I know that coupling on NMR over two bonds is referred to as geminal coupling and over three bonds is referred to as vicinal coupling. However is there a term for coupling over one bond (such as a carbon-13 bonded to a fluorine?

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    $\begingroup$ As far as I know it's usually called "one-bond coupling". Like DSVA I've never heard of any other special term. For example: u-of-o-nmr-facility.blogspot.co.uk/2009/01/… $\endgroup$ Commented Jan 22, 2017 at 14:40
  • $\begingroup$ FWIW: geminal and vicinal are generic chemistry terms and not unique to NMR at all. The technically correct way to describe coupling is to use the J descriptor; but common expressions include directly bonded and especially one-bond coupling $\endgroup$
    – long
    Commented Jan 23, 2017 at 0:36

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I've never heard a special term but you can describe it as $^1 J$ or $^1 J_{CF}$ coupling using the systematic nomenclature.

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    $\begingroup$ Strictly speaking, the IUPAC convention for J specifies that the nucleus of higher mass should come first; hence this would be J(FC). Not sure that this convention is strictly adhered to in literature though $\endgroup$
    – long
    Commented Jan 23, 2017 at 0:40

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