The complexes of 1c are arranged in pairs with one nitro group (O1-N7-O2) having interactions with a terminal and capping chloride. These two types of pyrazolate interactions alternate parallel to the b-axis. Two other pyrazolates have reciprocal C-H…O interactions with a C6…O3 distance of 3.271 Å. The complexes of 1b are arranged in a manner that allows for the nitro groups of pyrazolates to be stacked with a N7…N7 distance of 3.246 Å. These pairs of cations are eclipsed and extend down the a-axis. The complexes of 1a are arranged in pairs that exhibit repulsions between a terminal chloride (Cl2) and the nitro group of a pyrazolate. The crystal packing viewed parallel to the Cu 3 plane for each molecule is shown in Figure 3. For simplicity, the crystal packing of the complex is shown separately from that of the cations. The types of interactions that dominate each polymorph are discussed more in depth in Section 3.3 (vide infra). As the name suggests, the three polymorphs give rise to vastly different crystal packing motifs.
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