From cation + -o- + -tropy. <span class="searchmatch">cationotropy</span> (uncountable) tautomerism...
with -tropy aeolotropy aerotropy allotropy anatropy antitropy barotropy <span class="searchmatch">cationotropy</span> chronotropy dystropy ergotropy geotropy gravitropy gyrotropy heliotropy...
cation exchange cationic cationization cationize cationoid cationotropic <span class="searchmatch">cationotropy</span> cation-π countercation dication hexacation monocation organocation pentacation...