Editing Technetium (section)

===Coordination and organometallic complexes===
[[File:Tc CNCH2CMe2(OMe) 6Cation.png|thumb|right|[[Technetium (99mTc) sestamibi|Technetium (<sup>99m</sup>Tc) sestamibi]] ("Cardiolite") is widely used for imaging of the heart.]]
Technetium forms a variety of [[coordination complex]]es with organic ligands. Many have been well-investigated because of their relevance to [[nuclear medicine]].<ref>{{cite journal |last1=Bartholomä |first1=Mark D. |last2=Louie |first2=Anika S. |last3=Valliant |first3=John F. |last4=Zubieta |first4=Jon |year=2010 |title=Technetium and gallium derived radiopharmaceuticals: Comparing and contrasting the chemistry of two important radiometals for the molecular imaging era |journal=Chemical Reviews |volume=110 |issue=5 |pages=2903–20 |doi=10.1021/cr1000755 |pmid=20415476 }}</ref>

Technetium forms a variety of compounds with Tc–C bonds, i.e. organotechnetium complexes. Prominent members of this class are complexes with CO, arene, and cyclopentadienyl ligands.<ref name=Alberto/> The binary carbonyl Tc<sub>2</sub>(CO)<sub>10</sub> is a white volatile solid.<ref>{{cite journal |last1 = Hileman |first1 = J.C. |last2 = Huggins |first2 = D.K. |last3 = Kaesz |first3 = H.D. |date = 1961 |title = Technetium carbonyl |journal = Journal of the American Chemical Society |volume = 83 |issue = 13 |pages = 2953–2954 |doi = 10.1021/ja01474a038|bibcode = 1961JAChS..83.2953H }}</ref> In this molecule, two technetium atoms are bound to each other; each atom is surrounded by [[octahedron|octahedra]] of five carbonyl ligands. The bond length between technetium atoms, 303&nbsp;pm,<ref>{{cite journal |last1 =Bailey |first1 = M.F. |last2 = Dahl |first2 = Lawrence F. |date =1965 |title = The crystal structure of ditechnetium decacarbonyl |journal =Inorganic Chemistry |volume =4 |issue = 8 |pages =1140–1145 |doi =10.1021/ic50030a011 }}</ref><ref>{{cite journal |last1 = Wallach |first1 = D. |date = 1962 |title = Unit cell and space group of technetium carbonyl, Tc2(CO)10 |journal = Acta Crystallographica |volume = 15 |issue = 10 |page = 1058 | bibcode=1962AcCry..15.1058W |doi = 10.1107/S0365110X62002789 }}</ref> is significantly larger than the distance between two atoms in metallic technetium (272&nbsp;pm). Similar [[carbonyl]]s are formed by technetium's [[Congener (chemistry)|congeners]], manganese and rhenium.{{sfn|Schwochau|2000|pp=286, 328}} Interest in organotechnetium compounds has also been motivated by applications in [[nuclear medicine]].<ref name=Alberto>{{cite book |last1=Alberto |first1=Roger |year=2010 |chapter=Organometallic radiopharmaceuticals |title=Medicinal Organometallic Chemistry |volume=32 |pages=219–246 |series=Topics in Organometallic Chemistry |isbn=978-3-642-13184-4 |doi=10.1007/978-3-642-13185-1_9 }}</ref> Technetium also forms aquo-carbonyl complexes, one prominent complex being [Tc(CO)<sub>3</sub>(H<sub>2</sub>O)<sub>3</sub>]<sup>+</sup>, which are unusual compared to other metal carbonyls.<ref name="Alberto" />