title: Temperature-controlled synthesis and luminescent properties of two novel coordination polymers modeled by hexa-carboxylate ligand derived from cyclotriphosphazene.
abstract: Solvothermal reactions of hexakis(4-formylphenoxy)cyclotriphosphazene (H(6)L1) with Cd(NO(3))(2)·4H(2)O in H(2)O/DMF under different synthesis temperatures produced two new compounds, namely, {[Cd(3)(C(42)H(24)O(18)P(3)N(3)) (H(2)O)(7)]·xGuest}(n) (1), and {[Cd(2)(C(42)H(24)O(18)P(3)N(3)) (H(2)O)(2)]·xGuest}(n) (2). Compound 1 exhibits a novel 3D framework adopting 2,4,6-connected 3-nodal topology with the point (Schläfli) symbol {4(4)·6(2)}{4(5)·6(2)·8(8)}{4} constructed from the joint of neutral Cd(2) SBUs, mono-Cd ions and L1 ligands. Compound 2 reveals a 2D crystal structure exhibiting a 3,6-connected 2-nodal kgd topology with the point (Schläfli) symbol {4(3)}(2){4(6)·6(6)·8(3)} constructed from the connection of Cd centers and L1 ligands. In these two compounds, the ligands L1 are fully deprotonated, whose six extended carboxyl arms connect six different/same metallic nodes to form high dimensional frameworks. The variable reaction temperature must be responsible for the higher coordination number and versatile coordination modes of carboxylates in 1 compared to the ones in 2, resulting in the formation of a distinct crystal structure. In the solid state, both complexes are photoluminescent (LMCT) at room temperature.
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. China. libao@mail.hust.edu.cn
authors.forename: Bao
authors.initials: B
authors.lastname: Li
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Dai
authors.forename: Xianggao
authors.initials: X
authors.lastname: Meng
authors.forename: Tianle
authors.initials: T
authors.lastname: Zhang
authors.forename: Chengmei
authors.initials: C
authors.lastname: Liu
authors.forename: Kaichao
authors.initials: K
authors.lastname: Yu
mesh_terms: D002104:Cadmium / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry*; D018360:Crystallography, X-Ray; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013696:Temperature
chemical_list: D002264:Carboxylic Acids; D009942:Organometallic Compounds; D009943:Organophosphorus Compounds; D011108:Polymers; D002104:Cadmium