36972-08-4Relevant academic research and scientific papers
Construction and magnetic properties of hemicyclic “phoenix crown” manganese clusters: Molecular assembly from {Mn5} to {Mn10} cluster
Tang, Qun,Yang, Yanli,Cheng, Ze,Chen, Xiuni,Lin, Qingmei,Zou, Zhiming,Zou, Hua-Hong,Liang, Fu-Pei
, (2020)
Two high-nuclearity manganese clusters formulated as [MnIIMnIII4(L)2(Py)8(N3)2]·2Py ({Mn5} cluster) and [MnIII10(L)5(DMF)6(H2O)4]·5DMF·9H2O ({Mn10} cluster), (H6L = N,N'-bis(2-salicylhydrazide)isophthalohydrazide, N3– = azide ion, Py = pyridine, and DMF = N,N'-dimethylformamide), were synthesized and structurally characterized. The four MnIII ions and one MnII ion in {Mn5} cluster are linked by two diacylhydrazine ligands to form hemicyclic “Phoenix crown” cluster structure. The {Mn10} cluster presents a deca-nuclear skeleton, which appears to be structurally equivalent to two “Phoenix crown” {Mn5} clusters bridged by a diacylhydrazine ligand. Interestingly, the double helix structure {Mn10} clusters can be also obtained via a simply dissolving and reassembling process of the “Phoenix crown” {Mn5} clusters in the mixed solution of DMF and CH3OH. The magnetic measurements show that {Mn5} and {Mn10} clusters reveal antiferromagnetic interactions.
Synthesis, structure and magnetic properties of cyclic 3d metal clusters based on N–N single bonds of diacylhydrazine ligand
Cheng, Ze,Liang, Fupei,Lin, Qingmei,Tang, Qun,Wu, Jingwei,Zhang, Hongyi,Zhang, Yan,Zou, Huahong
, (2020)
Two cyclic high-nuclearity 3d metal clusters formulated as [CoII8CoIII4(bdsh)4(Py)12(MeOH)4(OAc)4]·14CH3OH·4H2O ({Co12} cluster) and [MnII4MnIII12MnIV4(bdsh)10(Py)2(DMF)8(H2O)8]·16DMF·2CH3OH·8H2O ({Mn20} cluster), (H6bdsh = N,N'-bis(2-salicylhydrazide)isophthalohydrazide, Py = pyridine, and DMF = N,N'-dimethylformamide), were synthesized by a conventional solution method. The {Co12} cluster presents a dodecanuclear ring structure consisting of two symmetrical hemicyclic skeletons bridged with two cobalt ions through the phenolic hydroxyl oxygen atom of H6bdsh ligand, the hemicyclic skeleton in which five cobalt ions are bridged by four N–N single bonds of diacylhydrazine ligands. The {Mn20} cluster exhibits a double cyclic structure comprising of two decanuclear ring skeleton bridged with two phenolic hydroxyl oxygen atoms of H6bdsh ligands, the decanuclear skeleton in which ten manganese ions are bridged by ten N–N single bonds of five H6bdsh ligands. Magnetic studies reveal the existence of antiferromagnetic interactions in both {Co12} and {Mn20} clusters.
Bis-salicyloyl-dicarboxylic acid dihydrazides as stabilizers for polyolefines
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, (2008/06/13)
New bis-salicyloyl-dicarboxylic acid dihydrazides are stabilizers for polyolefines. They are prepared by reacting a salicylic acid hydrazide with a dicarboxylic acid chloride or a dicarboxylic acid diester.
