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Published on: November 27, 2015
Diacetatobis(propane-1,3-diamine)nickel(II) dihydrate
Abstract:
In the title complex, [Ni(CH(3)COO)(2)(C(3)H(10)N(2))(2)]·2H(2)O, the Ni(II) atom resides on a centre of symmetry and is in an octa-hedral coordination environment comprising four amino N atoms and two carboxyl-ate O atoms. Inter-molecular N-H⋯O and O-H⋯O hydrogen bonds produce R(2) (1)(6), R(2) (2)(12), R(3) (2)(8) and R(5) (5)(16) rings, which generate a two-dimensional polymeric network parallel to (001).
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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.

