Coordination Chemistry Reviews 253 (2009) 1947–1965
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Coordination Chemistry Reviews
journal homepage: www.elsevier.com/locate/ccr
Review
Developments in tellurium containing macrocycles
Arunashree Panda
∗
Chemistry Group, Birla Institute of Technology and Science, Pilani-Goa Campus, Goa 403 726, India
Contents
1. Introduction ........................................................................................................................................ 1947
2. Telluraporphyrins .................................................................................................................................. 1948
3. Homoleptic macrocyclic polytelluroethers ........................................................................................................ 1952
4. Metallomacrocycles ................................................................................................................................ 1953
5. Mixed donor (N/O/S/Te) macrocycles .............................................................................................................. 1954
5.1. Te/N macrocycles ........................................................................................................................... 1954
5.2. Te/O macrocycles ........................................................................................................................... 1958
5.3. Te/S macrocycles............................................................................................................................ 1962
6. Cryptand............................................................................................................................................ 1963
7. Comparisons of X-ray crystal structures ........................................................................................................... 1964
8. Conclusions and outlook ........................................................................................................................... 1964
Acknowledgements ................................................................................................................................ 1965
References.......................................................................................................................................... 1965
article info
Article history:
Received 7 October 2008
Accepted 27 March 2009
Available online 5 April 2009
Keywords:
Tellurium
Macrocycles
Cryptand
Porphyrin
Schiff base
abstract
The chemistry of tellurium containing macrocycles starting from the report of the first macrocyclic
organotellurium(IV) chelates in 1982 is reviewed.
© 2009 Elsevier B.V. All rights reserved.
1. Introduction
Tellurium is a silvery white and semi-metallic rare element.
Organotellurium ligands find uses in organic chemistry, precursors
for metal-organic chemical vapor deposition (MOCVD) of semicon-
ducting materials, ligand chemistry, biochemistry, etc. Over recent
years, considerable effort has been directed towards the design and
Abbreviations: S2TPP, tetraphenyl-21,23-dithiaporphyrin; S,TeTPP, tetraphenyl-
21-tellura-23-thiaporphyrin; Te2TPP, 5,10,15,20-tetraphenyl-21,23-ditellurapor-
phyrin; 8Te2, 1,5-ditelluracyclooctane; 9S2Te, 1,4-dithia-7-telluracy-
clododecane; 11S2Te, 1,4-dithia-8-telluracycloundecan; 12S2Te, 1,5-dithia-9-
telluracyclododecane; 18O4Te2, 1,10-ditellura-4,7,13,16-tetraoxacyclooctadecane;
9O2Te, 1-tellura-4,7-dioxacyclononane; Dic-Te, 4
-(2-pyridylmethyleneamino)-
benzo-10-tellura-15-crown-5; 12Te3, 1,5,9-tritelluradodecane.
∗
Tel.: +91 832 2580389; fax: +91 832 2557033.
E-mail address: panda
arunashree@yahoo.com.
synthesis of telluroether macrocyclic ligands. However, while sev-
eral macrocyclic selenoethers are now known, telluroether crowns
arestillrare.The large size of tellurium atomandtheelectronegativ-
ity difference of Te and C atoms make Te–C bond more polarizable.
The high reactivity of the Te–C bond compared to S–C and Se–C
bonds along with the toxicity of the organotellurium compounds
has held back research in this area. Polyselenoether macrocycles
have been shown to exhibit rich coordination chemistry for a wide
range of d- and p-block elements [1–6]. The introduction of tel-
lurium atoms into a macrocycle adds an additional probe, i.e.
125
Te
NMR which would give invaluable structural information about
the macrocyclic ligands and complexes in solution and this has
enhanced the interest in telluromacrocycles.
125
Te is a spin 1/2
nucleus with a receptivity of ca. 12.5 times that of
13
C nucleus,
a natural abundance of 7% and a very large chemical shift range.
Moreover, the lower electronegativity of Te combined with its
greater s electron properties over S and Se [7] should yield lig-
0010-8545/$ – see front matter © 2009 Elsevier B.V. All rights reserved.
doi:10.1016/j.ccr.2009.03.025