title: A novel manganese(II) coordination polymer with azide and neutral dicarboxylate ligands: helical structure and magnetic properties.
abstract: By using a neutral inner-salt-type dicarboxylate as coligand, a novel two-dimensional (2D) manganese(II) coordination polymer, [Mn(L)(N(3))]ClO(4) x 1/2 H(2)O (L = 1,3-bis(3-carboxylatopyridinium)propane), was synthesized, and characterized by X-ray crystallography and magnetic measurements. The compound contains uniform Mn(II) chains with simultaneous azide and carboxylate bridges between adjacent Mn(II) ions. The formally negative chains are interlinked by the positively-charged 1,3-bis(pyridinium)propane spacer, and the spiral conformation of the spacer imports intriguing helical features to the resulting 2D network, in which [MnL] helices are connected by sharing metal centers with alternating centro- and C(2)-symmetry. The triple (azide)bis(carboxylate) bridge mediates overall antiferromagnetic coupling with J = -3.0 cm(-1), as a result of the competition between the antiferromagnetic (carboxylate) and ferromagnetic (azide) pathways.
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, 200062, PR China.
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Tian
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Sun
authors.forename: Qin-Xiang
authors.initials: QX
authors.lastname: Jia
authors.forename: Hua
authors.initials: H
authors.lastname: Tian
authors.forename: En-Qing
authors.initials: EQ
authors.lastname: Gao
mesh_terms: D001386:Azides / Q000737:chemistry*; D003998:Dicarboxylic Acids / Q000737:chemistry*; D008024:Ligands; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011407:Propane / Q000031:analogs & derivatives / Q000737:chemistry; D011726:Pyridinium Compounds / Q000737:chemistry
chemical_list: D001386:Azides; D003998:Dicarboxylic Acids; D008024:Ligands; D009942:Organometallic Compounds; D011108:Polymers; D011726:Pyridinium Compounds; D008345:Manganese; D011407:Propane