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Crystals of polymeric cerium(III) 1,2,3-propane­tri­carboxyl­ate dihydrate, [Ce(C6H5O6)(H2O)2]n, were grown under hydro­thermal conditions. The nine-coordinate Ce atoms occur as centrosymmetric pairs. Two bidentate and three monodentate carboxyl­ate groups, each from a different anion, and two water mol­ecules are coordinated to each cerium ion. Ce-O distances range from 2.390 (3) to 2.637 (2) Å. Each anion is joined to five cerium ions, forming a three-dimensional network.

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The title compound, C12H12N6, is the minor trans product of the preparation of a dihydrotetrazine. Extensive electron delocalization is shown by the planarity of the molecule, except for one pyridyl group twisted out of plane by only 14.1 (1)°. The C=N-N=C fragment has a C-N distance of 1.297 (2) Å and an N-N distance of 1.404 (2) Å. All other C-N distances are close to 1.34 Å, typical of C[pdbond]N bonds. The NH2 groups form hydrogen bonds to pyridyl and hydrazine N atoms of adjacent molecules.

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The structure of penta­barium ditantalum dichloride nona­oxide, Ba5Ta2Cl2O9, is isotypic with Ba5Ru1.6W0.4Cl2O9 and with one polymorph of Ba5Ru2Cl2O9. It is related to the perovskite structure and shows a ten-layer stacking of BaO3 and BaCl blocks along the c axis. The Ta cations occupy octa­hedral inter­stices, forming Ta2O9 dimers of distorted face-shared TaO6 octa­hedra. Except for one O atom, all atoms are situated on special positions: Ba1 (Wyckoff position \overline 6m2), Ba2 and Ba3 (3m.), Ta (3m.), Cl (3m.) and O1 (mm2).

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The first biological crystal-growth experiment on the International Space Station used the Enhanced Gaseous Nitrogen Dewar and produced thaumatin crystals diffracting to 1.28 Å, which is comparable to previous space-grown thaumatin crystals and better than the best ground-control crystal (1.47 Å).

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