Heteronuclear (typically
\(\ce{^{13}C}\)) detected long range 2D correlation experiment in
nuclear magnetic resonance spectroscopy that has mostly been superseded by
heteronuclear multiple bond correlation (HMBC) experiments and its variants.
Note:
COLOC is often used to show spin-spin coupling between hydrogen and carbon nuclei 2 and 3 bonds apart.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 684 (https://doi.org/10.1515/pac-2019-0203)