SYNTHESIS, CRYSTAL-STRUCTURE AND SPECTRAL PROPERTIES OF [MN-2(BZACEN)(2)(MEOH)(2)(MU-4,4'-BIPY)](CLO4)(2)

The title complex [Mn-2(bzacen)(2)(MeOH)(2)(mu-4,4'-bipy)](ClO4)(2) cr ystallizes the monoclinic system, space group P2(1)/n, with parameters : a = 1.308 2(3) nm, b = 1.271 3(3) nm, c = 1.800 6(5) nm, beta = 110. 91 (2)degrees, V = 2.798(2) nm(3), D-c = 1.45 g/cm(3), Z = 2, F(000) = 1 268, mu = 5.97 cm(-1). The final R value is 0.058 0 for 2 961 obser ved reflections with I greater than or equal to 3 sigma(I). The comple x cation has a bimeric structure with a 4,4'-bipyridine bridging the t wo [Mn(bzacen)(MeOH)](+) moieties. Mn(I) ion shows a distorted octahed ral coordination with four bonds to N2O2 donor atoms of Schiff base li gand bzacen(2-) in the basic plane, one O atom of the MeOH and one N a tom of the bridging 4,4'-bipyridine being in the two opposite sites. T he shifts of upsilon(C=N), upsilon(C=O) and upsilon(C=C) to lower freq uencies in IR and Raman spectra indicate that the ligand bzacen(2-) is coordinated to Mn atom through its nitrogen and oxygen atoms. The lin es observed at 463 cm(-1) and 401 cm(-1) in Raman spectrum are assigne d to Mn-O and Mn-N vibrations, respectively. The obsorption at about 1 110 cm(-1) shows that ClO4- is not coordinated with Mn atom. There ar e pi-pi transition, d-pi* charge-transfer transitions and d-d* transi tion in electronic spectrum. The current potential curve in acetonitri le exhibits that Mn(I) is in a stable valence state.