Impurity spin resonance and spin-cluster resonance in ${\left(\mathrm{C}{\mathrm{H}}_3\right)}_3\mathrm{NH}{\mathrm{Co}}_{1-x}{\mathrm{Mn}}_x{\mathrm{Cl}}_3·{2\mathrm{H}}_2\mathrm{O}$

Resonance of manganese impurities in the quasi-one-dimensional Ising-like magnetic system ${\left(\mathrm{C}{\mathrm{H}}_3\right)}_3$NHCo${\mathrm{Cl}}_3$·2${\mathrm{H}}_2$O has been observed in the frequency-field region 18-58 GHz, 0-7 T, whereas in this same region resonance of copper impurities could not be discovered. Detailed analysis of the manganese resonance spectrum will provide information about the strength and nature of the Mn-Co interaction. Resonances of the cobalt hosts were also observed; these resonances are of the spin-cluster type and therefore contain information about the Co-Co interchain exchange interaction.