摘要:
The tetranuclear manganese(II) complex [Mn-4(PPi)(6)](BPh4)(2) (2) (Hppi = 2-pyridylmethyl-2-hydroxyphenylimine) is prepared by using the precursor complex [Mn(PPi)(2)]-H2O (1). Based on UV/Vis- and IR-spectroscopy data in combination with mass spectrometry it has been concluded that I is a mononuclear neutral Mn-II complex, in which two ppi ligands chelate the manganese atom. Compound 2 crystallizes in the tri-clinic space group P (1) over bar (no. 2), with a = 17.500(3), b = 17.955(4), c = 19.101(4) Angstrom, alpha = 113.79(3)degrees, beta = 111.33(3)degrees, gamma = 93.91(3)degrees, V = 4950(2) Angstrom(3) and Z = 2. In the tetranuclear [Mn-4(PPi)(6)](2+) compplex cation Mn(l), Mn(2), and Mn(3) are equivalently coordinated by two deprotonated Hppi ligands leading to a N4O2 donor set. The environment of the central Mn(4) is formed by coordination of three [Mn(PPi)(2)] fragments resulting in a phenoxo bridged star-shaped Mn4O6 core motif. The average distance of directly adjacent manganese ions is 3.310 Angstrom, whereas the average distance of Mn(1), Mn(2), and Mn(3) among each other is 5.732 Angstrom.