Novel mono/trinuclear palladium/platinum complexes have been synthesized and characterized by X-ray diffraction, electrochemical, and thermogravimetric analyses. All the complexes possess catecholate derivatives, which have been known to show rich redox activity. Almost complexes show multi-step thermal phase transitions, and each transition was studied by XRPD and DSC measurements. Interestingly, the complexes demonstrate redox activity based on the electronically labile nature of the catecholate derivatives. The results obtained in this study clearly suggest that the complexes would be candidates for redox-active metallomesogens.