Tellurium azamacrocycles: synthesis, characterization and coordination studies

Menon, Saija C. ; Panda, Arunashree ; Singh, Harkesh B. ; Patel, Rajan P. ; Kulshreshtha, Shailendra K. ; Darby, Willie L. ; Butcher, Ray J. (2004) Tellurium azamacrocycles: synthesis, characterization and coordination studies Journal of Organometallic Chemistry, 689 (9). pp. 1452-1463. ISSN 0022-328X

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jorganchem.2003.12.042

Abstract

The metal-free condensation of bis(2-formylphenyl) telluride (1) with a series of diamines affords macrocyclic tellurium ligands 2-7. Crystals of the protonated macrocycle 8 are monoclinic, space group P2/n with a=10.890(5), b=7.414(4), c=24.334(13) Å, Z=2. The reaction of tellurium containing macrocyclic Schiff base 2 with Pd(C6H5CN)2Cl2 gives the expected 1:1 product [Pd(II) 2]Cl2 (9). Complex 9 was treated with excess of NH4PF6 in methanol to give the analogous PF6 salt [Pd(II) 2] (PF6)2 (10). The crystals of 10 are monoclinic, space group P21/n, a=8.2250(10), b=21.280 (4), c=21.150 (4), Z=4. However, the reaction of 2 with Pt(COD)Cl2 proceeds via novel transmetallation to yield an organoplatinum complex (11). The crystals of 11 are also monoclinic, space group P21/n, a=12.3253 (14), b=14.6557 (14), C=13.4054 (11), Z=4. The octahedral Ni(II) complex 12 was prepared by the reaction of NiCl2·6H2O with 2 and NH4PF6 under an inert atmosphere. For 12: triclinic, space group P1̅; Z=2; a=10.800(8), b=13.468(9), c=13.918(11), α=89.67(6)°, β=101.53(7)°, γ=81.49(3)° and V=1961(3). Cyclic voltammetry of 12 in MeCN solution shows a well-behaved quasi-reversible (ΔE=100 mV) Ni(III)↔Ni(II) couple. The metal-free condensation of bis(o-formylphenyl)telluride with a series of diamines affords macrocyclic tellurium ligands. The reaction of macrocyclic Schiff base 2 with Pd(II)/Ni(II) metal ions followed by NH4PF6 addition gives the corresponding 1:1 cationic complexes whereas, reaction with Pt(II) proceeds via novel transmetallation.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Tellurium; Macrocycle; Schiff Base; Te-C Bond; Cleavage; Transmetallation
ID Code:47583
Deposited On:11 Jul 2011 13:41
Last Modified:11 Jul 2011 13:41

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