Search for Majoron-emitting modes of double-beta decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Xe</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>136</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>with EXO-200

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}\mathrm{Xe}$. Here, we report on a search for various Majoron-emitting modes based on 100 kg yr exposure of $^{136}\mathrm{Xe}$. A lower limit of ${T}_{1/2}^{^{136}\mathrm{Xe}}&gt;1.2\ifmmode\times\else\texttimes\fi{}{10}^{24}\text{ }\text{ }\mathrm{yr}$ at 90% C.L. on the half-life of the spectral $\mathrm{index}=1$ Majoron decay was obtained, corresponding to a constraint on the Majoron-neutrino coupling constant of $|⟨{g}_{ee}^{M}⟩|&lt;(0.8--1.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$.