1037701-18-0Relevant articles and documents
Synthesis and characterization of a family of penta- and tetra-manganese(III) complexes derived from an assembly system containing tert-butylphosphonic acid
Wang, Mei,Ma, Cheng-Bing,Yuan, Da-Qiang,Wang, Hui-Sheng,Chen, Chang-Neng,Liu, Qiu-Tian
, p. 5580 - 5590 (2008)
A family of manganese complexes, [Mn5O3(t-BuPO 3)2(MeCOO)5(H2O)(phen)2] (1), [Mn5O3(t-BuPO3)2(PhCOO) 5(phen)2] (2), [Mn4O2(t-BuPO 3)2(RCOO)4(bpy)2] (R = Me, (3); R = Ph, (4)), NBun4[Mn4O2(EtCOO) 3(MeCOO)4(pic)2] (5), NR′ 4[Mn4O2(i-PrCOO)7(pic)2] (R′ = Bun, (6); R′ = Et, (7)), were synthesized and characterized. The seven manganese clusters were all prepared from a reaction system containing tert-butylphosphonic acid, Mn(O2CR)2 (R = Me, Ph) and NR′4MnO4 (R′ = Bun, Et) with similar procedures except for using different N-containing ligands (1,10-phenanthroline (phen), 2,2′-bipyridine (bpy) and picolinic acid (picH)) as coligands. The structures of these complexes vary with the N-containing donors. Both the cores of complexes 1 and 2 feature three μ3-O and two capping t-BuPO32- groups bridging five MnIII atoms to form a basket-like cage structure. Complexes 3 and 4 both have one [Mn4(μ3-O) 2]8+ core with four coplanar MnIII atoms disposed in an extended butterfly-like arrangement and two capping μ3-t-BuPO32- binding to three manganese centers above and below the Mn4 plane. Complexes 5, 6, and 7 all possess one [Mn4(μ3-O)2]8+ core just as complexes 3 and 4, but they display a folded butterfly-like conformation with the four MnIII atoms nonplanar. Thus, the seven compounds are classified into three types, and three representative compounds 1·2H2O·MeOH·MeCN, 3·6H 2O·2MeCOOH, and 5·0.5H2O have been characterized by IR spectroscopy, ESI-MS spectroscopy, magnetic measurements and in situ UV-vis-NIR spectroelectrochemical analysis. Magnetic susceptibility measurements reveal the existence of both ferromagnetic and antiferromagnetic interactions between the adjacent Mn' ions in compound 1·2H 2O·MeOH·MeCN, and antiferromagnetic interactions in 3·6H2O·2MeCOOH and 5·0.5H2O. Fitting the experimental data led to the following parameters: J1 = -2.18 cm-1, J2 = 6.93 cm-1, J3 = -13.94 cm-1, J4 = -9.62 cm-1, J5 = -11.17 cm-1, g = 2.00 (1·2H2O·MeOH·MeCN), J1 = -5.41 cm-1, J2 = -35.44 cm-1, g = 2.13, zJ′ = -1.55 cm-1 (3·6H2O· 2MeCOOH) and J1 = -2.29 cm-1, J2 = -35.21 cm-1, g = 2.02, zJ′ = -0.86 cm-1 (5·0.5H 2O).
