title: Tailoring microstructures of isopolymolybdates: regular tuning of the ligand spacer length and metal coordination preferences.
abstract: Four new isopolymolybdate compounds based on two kinds of isomers, [Cu(I)(2)bte][a-Mo(3)O(10)] (1), [Cu(I)(2)btp][b-Mo(3)O(10)].H(2)O (2), [Cu(II)(bte)(1.5)(H(2)O)][gamma-Mo(8)O(26)](0.5) (3) and [Cu(II)(btp)(2)(H(2)O)][beta-Mo(8)O(26)](0.5).2H(2)O (4) [bte = 1,2-bis(1,2,4-triazol-1-yl)ethane, btp = 1,3-bis(1,2,4-triazol-1-yl)propane], were obtained under hydrothermal conditions, indicating that isopolymolybdate clusters can be tailored by regular tuning of the spacer length of the flexible ligands and the metal coordination preferences. In compound 1, wave-like a-[Mo(3)O(10)](2-) chains intersect with [Cu(I)(2)bte](2+) chains by sharing Cu(I) cations, forming a 3D framework. Compound 2, with a similar 3D structure but different ligand (btp) to 1, is based on linear b-[Mo(3)O(10)](2-) chains. In compound 3, gamma-[Mo(8)O(26)](4-) chains insert into the rectangular windows of parallel [Cu(II)(2)bte](4+) sheets and connect them via four Cu(II)-O bonds, leading to a 3D framework. Compound 4 is an unusual 2D-->3D polycatenated array of a [Cu(II)(btp)(2)(H(2)O)][beta-Mo(8)O(26)] pillar-layered framework. The thermal stability and luminescent properties of compounds 1-4 were investigated in the solid state.
authors.affiliation: Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.
authors.forename: Chun-Jing
authors.initials: CJ
authors.lastname: Zhang
authors.forename: Hai-Jun
authors.initials: HJ
authors.lastname: Pang
authors.forename: Qun
authors.initials: Q
authors.lastname: Tang
authors.forename: Hui-Yuan
authors.initials: HY
authors.lastname: Wang
authors.forename: Ya-Guang
authors.initials: YG
authors.lastname: Chen
mesh_terms: D002412:Cations / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D008024:Ligands; D049449:Luminescence; D008670:Metals / Q000737:chemistry*; D055616:Microtechnology; D008958:Models, Molecular; D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
chemical_list: D002412:Cations; D003300:Copper; D008024:Ligands; D008670:Metals; D008982:Molybdenum; D011108:Polymers; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates; C044659:molybdate