Synthesis and single crystal structural investigations on quaternary salts of tellurated alkylamine derivatives

Add time:08/07/2019    Source:sciencedirect.com

Tellurated alkylamine derivatives 4-CH3OC6H4Te(CH2)2NH3+Cl-(1), 4-CH3OC6H4Te(Cl2)(CH2)3NH3+Cl-(2),Cl2Te((CH2)2NH3+Cl-)2(3) and Cl2Te((CH2)3NH3+Cl-)2(4) have been synthesized by reacting appropriate organic halides with the nucleophile 4-CH3OC6H4Te− or Te2− generated in situ by borohydride reduction of (4-CH3OC6H4Te)2 or Te powder followed by reaction with HCl of appropriate concentration. The zwitterionic species [−Cl4Te(CH2)3NH3+] was generated when single crystals of 2 were grown in methanol at 0 °C. Complexes 1–4 exhibit characteristic 1H NMR spectra. The single crystal structures of 1–4 and 2a have been determined. In the crystals of 1, C–H⋯π distances have been found to be 3.31(7)–3.59(5) Å. In both 2 and 2a, weak Te⋯Cl interactions (3.54(2) –3.62(2) Å) are observed. The C–H⋯π distance in the crystal of 2 is 3.19(0) Å. In 2a and 3, water hydrogen bonds connect the water molecules with the end NH3+ groups from different molecules. In the case of 3, Te⋯Cl weak interactions involving the Cl− ions connect together two such chains. The geometry of Te in 1 is V shaped. In 2 and 3 it is pseudo trigonal bipyramidal, and in 2a, it is square pyramidal. However, in the latter case it becomes distorted octahedral due to weak Te⋯Cl secondary interactions. The geometry about Te in 4 is distorted octahedral due to weak Te⋯Cl interactions involving Cl− ions. However, there are no intermolecular Te⋯Cl interactions.

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