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The importance of the thiadiazole ring: While electrostatic interactions between the thiadiazole rings is responsible for the 2D close packing in the solid-state structure of tetrakis(thiadiazole)porphyrazine (TTDPzH2, see X-ray crystal structure), the formation of a coordination bond between the ring and the cobalt ion results in the cobalt derivative TTDPzCo having a chain structure.
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Suzuki et al. (2003) studied this question.
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