The structures of Con(NO3)2(12-crown-4), [Co(C s-H1604)(NOa)21, (I), and Con(H20)2(15-crown-5) -(NO3) 2, [Co(CIoH20Os)(H20)2I(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% respectively. The oxygen atoms of each crown-ether ring are directly coordinated to CC I, 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).
A convenient pH cell has been constructed for use in titration experiments where the solution should be protected from the air. The cell has a large opening that will accomodate both a buret and electrode. It also aides sample introduction. The cell also has the advantage of needing only about 5 ml of initial solution. An additional 40 ml of titrant can be added. Nitrogen or another gas may be placed over the sample solution.
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