Hydrothermal syntheses and characterizations of two novel heteropolytungstate supported coordination compounds

A novel sandwich-type POM supported transition metal coordination complexes: {P2VW18VIWang1, Chen2, Zou3 et al. 2009Inorganic Chemistry CommunicationsSelf Cite4000View full textAdd to dashboardCite

“…Recently, an advance of POM chemistry is that a large number of hybrid compounds constructed from the combination of POMs as building blocks (such as Keggin-, WellsDawson-, Anderson-and Lindquist-type anions) and transition metal cations or transition metal coordination complexes (TMCs) have been obtained, which could be grouped into four categories: (I) extended structures connected by POMs and transition metal cations or TMCs [2][3][4][5][6][7][8][9][10]; (II) discrete POMs supported transition metal coordination complexes [11][12][13][14][15]; (III) discrete POMs with TMCs as counterions [16,17]; and (IV) transition metal substituted POMs [18][19][20], of which, the transitional metal substituted sandwich-type POMs represent an interesting subclass. To date Weakley-, Hervé-, Krebs-, and Knoth-type sandwiched polyoxoanions have already been distinguished.…”

“…It contains three TMCs, one of which was supported by the Weakley-type POM and the other two only serve as counterions. The most striking feature of compound 1 is that it contains a (H 2 O) 14 water cluster in the structure. To the best of our knowledge, it is the first example of which sandwiched POMs combine with water clusters into a supramolecular architecture.…”

“…The most striking feature of compound 1 is that there exists a (H 2 O) 14 water cluster (Fig. 2), which could be divided into two parts: a hexamer water cluster which are decorated with two coordinated water molecules through hydrogen bonds and two tetramer water clusters decorated with one coordinated water molecule.…”

“…Ow(4b), Ow(8b) and Ow(9c) join together to form a triangle motif through hydrogen bonds with distances of 2.88(3) Å, 2.89(2) Å and 2.76(3) Å, respectively. While Ow(4b) is linked to Ow(2b) via hydrogen bonds with distance of 2.86(2) Å. two tetramer water clusters are connected by the hexamer water cluster into a novel (H 2 O) 14 water cluster via the hydrogen bond Ow(7d)Á Á ÁOw(8b) and its symmetry equivalent with distance of 2.73(4) Å. The average OWÁ Á ÁOW distance is 2.829 Å, which is slightly shorter than those observed in liquid water (2.854 Å) [37] and comparable to those in the ice II phase (2.77-2.84 Å) [38].…”

“…The (H 2 O) 14 water cluster interacts with the POMs via hydrogen bonds (Fig. S1), of which the hexamer links with the POMs through hydrogen bonds between Ow(3)Á Á ÁO(13) (x, y, 1 + z), Ow(3)Á Á ÁO(25) (Àx, 2 À y, 1 À z) and Ow(6)Á Á ÁO(11) (x, y, 1 + z) (and their symmetry equivalents) with distances of 2.81(1) Å, 2.91(1) Å and 2.86(2) Å, respectively.…”