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The pseudopolymorphic solvates [{Te(CN)4(CH3CN)2}n] and [{Te(CN)4(thf)3}n] form coordination polymers in the solid state in which Te(CN)3 units are connected by CN groups in cis position to form infinite chains. The picture shows a section of [{Te(CN)4(thf)3}n]. In contrast, the tellurium tetrafluoride solvate [TeF4(thf)2] contains monomeric ψ-trigonal-bipyramidal TeF4 units.
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Lentz et al. (2005) studied this question.
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