Cis-(Diethyldithiocarbamato)diiodo(phenyl)tellurium(IV), PhTe(S2CNEt2)I2, and its Methoxy-Substituted Mixed Br/I Analogue cis-Bis(0.4-bromo/0.6-iodo)(diethyldithiocarbamato)(4-methoxyphenyl)tellurium(IV),p-MeOC6H4Te(S2CNEt2)(Br0.4I0.6)2

Abstract

The Te IV complexes PhTe(S 2 CNEt 2 )I 2 , (1), and p-MeOC 6 H 4 Te(S 2 CNEt 2 )(Br 0.4 /I 0.6 ) 2 , (2), have been synthesized by reacting PhTeI 3 with NaS 2 CNEt 2 , and p-MeOC 6 H 4 Te(S 2 CNEt 2 ) 2 I with Br 2 , respectively. In (2), both I atoms are partially replaced by Br atoms in a 3:2 ratio. The structures display distorted octahedral Te coordination with two symmetrically coordinated S atoms [Te-S 2.550 (2)-2.569 (2)A in three independent molecules of (1) and 2.523 (1) and 2.535 (1) in (2)] and with two cis-disposed halogen atoms [Te-I 2.941 (1)-2.986(1) A in (1) and 3.003(4) and 3.049 (3) A in (2); Te-Br 2.962(8) and 2.967(8) A in (2)] in equatorial positions. The aryl group is axial in both complexes [Te-C 2.137 (6)-2.146 (6) and 2.123 (5) A in (1) and (2), respectively] and the second axial position is occupied by a halogen atom of a neighbouring molecule [Te...I 3.898 (1)-4.233 (1) A in (1); Te...I 3.872 (3) A and Te...Br 3.676 (6) A in (2); trans angles C-Te...I(Br) 153.4 (2)-177.7 (2)° ] so that the molecules are joined into (quasi)centrosymmetric pairs by these secondary interactions.