Cu2[Cu(H2O)4][(CH2)4(NH3)2][C6H2(COO)4]2·4H2O - A MOF with Channel-like Voids

What is it about?

Triclinic single crystals of Cu2[Cu(H2O)4][(CH2)4(NH3)2][C6H2(COO)4]2·4H2O have been prepared in aqueous solution at 55 °C. Space group P-1 (no. 2), a=799.73(7), b=977.43(8), c=1086.27(9) pm, alpha=87.194(7), beta=84.679(7), gamma=74.744(6)°, V=0.81540(12) nm3, Z=1. There are two unique Cu2+ with CN 4+1 (Cu(1)) and CN 4+2 (Cu(2)), respectively. The Cu-O distances range from 197.4(2) to 214.9(2) pm (Cu(1)) and 191.6(2) to 240.1(4) pm (Cu(2)). There is a short Cu(1)-Cu(1) contact of 267.02(6) pm. A three-dimensional coordination polymer with negative excess charge and channel-like voids extending parallel to [-1 1 0] is made up by Cu2+ and [C6H2(COO)4]4- . These voids accomodate [(CH2)4(NH3)2]2+ and water molecules, which are not coordinated to Cu2+. Thermoanalytical measurements in air indicated a step-wise loss of water of crystallization commencing at 63 °C, which is finished at approx. 250 °C followed by an exothermic decomposition yielding CuO. The Cu(1) pairs show antiferromagnetic coupling.

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