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33100-27-5, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 33100-27-5, C10H20O5. A document type is Article, introducing its new discovery.
Transition-Metal-Crown-Ether Complexes. III. Seven-Coordinate CoII in Dinitratocobalt(II)-12-Crown-4 and Diaquacobalt(II) Dinitrate-15-Crown-5
The structures of CoII(NO3)2(12-crown-4), , (I), and CoII(H2O)2(15-crown-5)(NO3)2, (NO3)2, (II), have been determined from single-crystal X-ray diffractometer data at 291(2) K and refined by least-squares methods to R = 2.7 and 4.7 percent respectively. (I) crystallizes in orthorhombic space group Pna21, a = 12.478(3), b = 7.567(2), c = 14.231(6) Angstroem, V = 1343.7(8) Angstroem3, Z = 4, Dm = 1.75, Dc = 1.775 Mg m-3 and (II) crystallizes in tetragonal space group P41212, a = b = 8.079(1), c = 27.231(5) Angstroem, Z = 4, V = 1777.4(5) Angstroem3, Dm = 1.66 and Dc = 1.641 Mg m-3.The oxygen atoms of each crown-ether ring are directly coordinated to CoII, which is seven coordinate in each structure by additional coordination to two oxygens of one nitrate group and one oxygen of the other nitrate group in (I) and coordination to two water oxygens in (II).
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Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare