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Four novel linear trinuclear manganese clusters [Mn 3 (L n ) 2 (CH 3 COO) 4 ] ( 1 , n = 1; 2 , n = 2; 3 , n = 3; 4 , n = 4. where HL 1 is 4-chloro-2-((2-(6-chloropyridin-2-yl)hydrazono)methyl)phenol, HL 2 is 4-bromo-2-((2-(6-chloropyridin-2-yl)hydrazono)methyl)phenol, HL 3 is 4-chloro-2-((2-(6-bromopyridin-2-yl)hydrazono)methyl)phenol, HL 4 is 4-bromo-2-((2-(6-bromopyridin-2-yl) hydrazono)methyl)phenol) were synthesized through solvothermal method. Complexes 1 – 4 were characterized by IR, and X-ray single-crystal diffraction. Complexes 1 – 4 are isomorphous compounds which are trinuclear linear manganese clusters. A detailed analysis of Hirshfeld surface and 2D fingerprint plots revealed that 1 – 4 were supported mainly by H⋯H, H⋯X (X = Cl, Br) and O⋯H intermolecular interactions. Magnetic properties of 1 – 4 have been studied. In additional, complex 3 showed highly intense electrochemicaluminescence (ECL) in DMF solution. [ABSTRACT FROM AUTHOR]