Nowadays, the construction of inorganic-organic networks through crystal engineering has been the subject of much interest. Polyoxometalates (POMs), which are nanosized metal-oxide clusters and unusually effective inorganic ligands, have been widely investigated because of their distinctive topological structures and versatile applications. Due to importance of this field, a novel series of inorganic- organic hybrid materials based Keggin-type POMs and lanthanoids coordination compounds have been successfully synthesized under hydrothermal conditions. In addition, the influences of steric hindrance of organic ligands, in situ transformation of organic ligand, charge density of POM, size of the lanthanoid ions and synthetic conditions on assembly of these POM-based hybrids have been systematically discussed [1-3]. The luminescent properties of some of these hybrids have been investigated. Monte Carlo simulation has been employed for predicting the ability of some of these hybrids to capture CH4 and CO2 and also to separate CH4/H2 and CO2/N2 mixtures. References [1] M. Mirzaei, H. Eshtiagh-Hosseini, M. Alipour, A. Frontera, Coord. Chem. Rev., 2014, 275, 1. [2] S. Taleghani, M. Mirzaei, H. Eshtiagh-Hosseini, A. Frontera, Coord. Chem. Rev., 2016, 309, 84. [3] M. Mirzaei, H. Eshtiagh-Hosseini, N. Lotfian, A. Salimi, A. Bauza, R. Van Deun, R. Decadt, M. Barcelo-Oliver, A. Frontera, Dalton Trans., 2014, 43, 1906.

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