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By use of mainly the exact diagonalization and the level spectroscopy method,we investigate the ground-state phase diagrams of the $S=1/2$ distorted diamondtype quantum spin chain with the monomer-monomer interactions and/orferromagnetic interactions for the zero magnetic field case, as well as the$M=M_{\rm s}/3$ case and the $M=(2/3)M_{\rm s}$ case, where $M$ is the totalmagnetization and $M_{\rm s}$ is the saturation magnetization. Themagnetization plateau at $M=M_{\rm s}/3$ vanishes in the region where theferromagnetic interaction is rather strong. The monomer-monomer interactionremarkably stabilizes the magnetization plateau at $M=(2/3)M_{\rm s}$.

Effect of monomer-monomer interactions on the phase diagrams of the S=1/2 distorted diamond type quantum spin chain