1：Experimental Design and Method Selection:

The study involved synthesizing a cyanide-bridged di-manganese complex and comparing its electrocatalytic and photochemical activities with monomeric precursors. Methods included UV-Vis, NMR, FTIR spectroscopy, cyclic voltammetry, bulk electrolysis, and photolysis experiments.

2：Sample Selection and Data Sources:

Complexes 1 ({[Mn(bpy)(CO)3]2(μ-CN)}ClO4), 2 ([Mn(bpy)(CO)3Br]), and 3 ([Mn(bpy)(CO)3CN]) were synthesized and characterized. Electrolytes were prepared with TBAP in MeCN, and samples were handled under argon to prevent degradation.

3：List of Experimental Equipment and Materials:

Equipment included a CHI 760D electrochemical workstation, Bruker AVANCE NMR spectrometer, Nicolet FT-IR spectrometers, Cary 60 UV-vis spectrophotometer, Ti-sapphire laser, X-ray diffractometer, gas chromatographs. Materials included manganese pentacarbonyl bromide, 2,2'-bipyridine, silver cyanide, silver perchlorate, TBAP, MeCN, etc.

4：Experimental Procedures and Operational Workflow:

Synthesis of complexes, electrochemical measurements under Ar or CO2 atmosphere, photolysis with 365 nm or 395 nm light, monitoring spectral changes, and product analysis via GC and IR.

5：Data Analysis Methods:

Digital simulation of CV data using DigiElch 4.0, statistical analysis of faradaic efficiencies, and comparison of catalytic efficiencies using ξcat parameter.