Abstract
Abstract The crystal structures of five methylene substituted crown ether compounds were investigated. [Na(OH2)(methylene-16-crown-5)]I is orthorhombic, P212121 with a = 7.920(9), b = 10.787(3), c = 20.870(5)A, and Dcalc = 1.54 g cm−3 for Z = 4. The sodium cation is coordinated to all five etheric oxygen atoms and a water molecule giving it a coordination number of six. [Na(NO2)(methylene-16-crown-5)]·0.5(H2O) is monoclinic, P21/n with a = 20.566(6), b = 8.605(9), c = 20.821(7)A, β = 115.66(3)·, and Dcalc = 130 g cm−3 for Z = 8. Each sodium cation is seven-coordinate, coordinated to all five etheric oxygen atoms and a bidentate nitrite anion. One crown molecule is severely disordered. The macrocycles in both methylene-16-crown-5 structures have essentially the same conformations. 3,16-dimethylene-26-crown-8 is orthorhombic, Pccn with a = 18.061(4), b = 14.320(4), c = 8.659(7)A, and Dcalc = 1.20 g cm−3 for Z = 4. The crown ether has an elongated cavity generated by a series of six consecutive anti torsion ...
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