A Novel Coordination Polymer Based on Decavanadate Units Linked by Copper(II) Ethylenediamine Complexes Diego Venegas-Yazigi, * 1,2 PatricioHermosilla-Iba´n˜ez, 1,2 Juan Costamagna, 1 Evgenia Spodine, 2,3 Andre´sVega, 2,4 Vero´nicaParedes-Garcı´a, 2,5 Eric Le Fur 6,7 Summary: A novel coordination polymer[{Cu(en) 2 }(V 10 O 28 )] n  2n[Cu(en) 2 (H 2 O)]  2n(H 3 BO 3 )  2n(H 2 O) was obtained by hydrothermal reaction. The compound crystal- lizes in the monoclinic crystal system, in the C2/c space group, with a ¼ 26.490 (3) A ˚ ; b ¼ 11.6558 (11) A ˚ ;c ¼ 19.8426 (19) A ˚ ; b ¼ 124.011 (1)8;V ¼ 5078.6(8) A ˚ 3 . The solid structure is formed by polymeric chains, [Cu(en) 2 (H 2 O)] 2þ cations, and boric acid and water solvate molecules, stabilized through a multiple hydrogen bond network. Keywords: copper(II); decavanadate; hydrothermal; infinite chain; Inorganic polymer Introduction The field of Inorganic Polymers or Coordi- nation Polymers has been extensively studied, due to their importance in applica- tions in materials science. Among inorganic polymers, three important subgroups can be mentioned: i) metal-organic frameworks (MOFs), ii) hybrid organo-inorganic frame- works and iii) functionalized polyoxome- talates (POMs). The first is basically formed by systems made of transition metal cations bridged by organic ligands, giving rise to structures showing different dimensionalities. The second subgroup comprises inorganic lat- tices, which are modified by the coordina- tion of transition metal complexes. The third corresponds to extended systems built up by the functionalization of polyoxome- talates with coordination complexes. For all the three groups the diversity of structures and dimensionalities that can be obtained, are function of the coordination plasticity, the oxidation state and the nature of the transition metal cation, and are also func- tion of the characteristics of the organic ligand, such as coordination centres, basi- city, flexibility, among others. Copper is a first row transition metal which has centred a great attention in many chemistry groups around the world, due to its coordination plasticity. Several MOFs based on copper can be mentioned, which are based on one type of organic ligand [1,2] or on two types of organic ligands. [3–6] The number of different types of ligands and the topology of the coordination centres of each ligand will determine the dimension- ality of the obtained polymer. A hybrid organo-inorganic system can be understood as the mixture of an inorganic part with organic molecules. A literature investigation about hybrid organo-inorganic extended systems shows that authors define as a hybrid organo- inorganic material, as an extended inor- ganic lattice which is functionalized with coordination compounds. An important Macromol. Symp. 2011, 304, 80–86 DOI: 10.1002/masy.201150611 80 1 Facultad de Quı´mica yBiologı´a,Universidad de San- tiago de Chile, USACH, Casilla 40 Correo 33 San- tiago, Chile E-mail: diego.venegas@usach.cl 2 Centro para el Desarrollo de la Nanociencia y Nano- tecnologı´a, CEDENNA. 3 Facultad de Ciencias Quı ´micas y Farmace ´ uticas, Uni- versidad de Chile. 4 Universidad Andres Bello, Departamento de Cien- cias Quı ´micas. 5 Departamento de Quı´mica, UniversidadTecnolo ´ gica Metropolitana. 6 ENSCR, CNRS, UMR 6226, Rennes, France 7 Universite ´ Europe ´enne de Bretagne, France Copyright ß 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim wileyonlinelibrary.com