Technetium(IV) chloride: Difference between revisions

| Watchedfields = changed

| verifiedrevid = 406189912

| ImageFile = TcCl4.svg

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|CAS}}

| ChemSpiderID = 73944719

| PubChem = 23047010

| StdInChI=1S/4ClH.Tc/h4*1H;/q;;;;+4/p-4

| StdInChIKey = DCEWLADEQKZQQZ-UHFFFAOYSA-J

| SMILES = [Cl-].[Cl-].[Cl-].[Cl-].[Tc+4]

}}

|Section2={{Chembox Properties

| Appearance = Red solid

| Density =

| MeltingPt =

| BoilingPtC = 300

| BoilingPt_ref = <ref name="web">{{RubberBible86th}}</ref>

|Section3={{Chembox Structure

| CrystalStruct = [[Orthorhombic]], [[Pearson symbol|oP40]]

| SpaceGroup = Pbca, No. 61

|Section4={{Chembox Thermochemistry

|Section7={{Chembox Hazards

| ExternalSDS =

| NFPA-S =

| HPhrases =

| PPhrases =

| GHS_ref =

| AutoignitionPt =

|Section8={{Chembox Related

| OtherAnions = [[Technetium(VI) fluoride]]

| OtherCations = [[Manganese(II) chloride]]<br />[[Rhenium pentachloride|Rhenium(V) chloride]]<br/>[[Ruthenium(III) chloride]]

'''Technetium(IV) chloride''' is the [[inorganic compound]] with the [[chemical formula|formula]] TcCl₄. It was discovered in 1957 as the first binary halide of technetium. It is the highest oxidation binary chloride of technetium that has been isolated as a solid. It is volatile at elevated temperatures and its volatility has been used for separating technetium from other metal chlorides.<ref name="tech">

| last = Schwochau

| first = Klaus

| year = 2000

| title = Technetium

| publisher = Wiley-VCH

| isbn = 978-3-527-29496-1

| page = 67

| url = https://books.google.com/books?id=BHjxH8q9iukC&q=%22Technetium+chloride%22&pg=PA67

}}</ref> [[Colloid]]al solutions of technetium(IV) chloride are [[Redox|oxidized]] to form Tc(VII) ions when exposed to [[gamma ray]]s.<ref name="spec">

| last1 = Fattahi

| first1 = M.

| last2 = Vichot

| first2 = L.

| last3 = Poineau

| first3 = F.

| last4 = Houée-Levin

| first4 = C.

| last5 = Grambow

| first5 = B.

| title = Speciation of technetium(IV) chloride under gamma irradiation

| journal = Radiochimica Acta

| volume = 93

| pages = 409–413

| year = 2005

| doi = 10.1524/ract.2005.93.7.409 | s2cid = 96640348

}}

Technetium tetrachloride can be synthesized from the reaction of Cl₂ with technetium metal at elevated temperatures between 300 and 500&nbsp;°C:<ref>{{Cite journal|last1=Johnstone|first1=Erik V.|last2=Poineau|first2=Frederic|last3=Forster|first3=Paul M.|last4=Ma|first4=Longzou|last5=Hartmann|first5=Thomas|last6=Cornelius|first6=Andrew|last7=Antonio|first7=Daniel|last8=Sattelberger|first8=Alfred P.|last9=Czerwinski|first9=Kenneth R.|date=2012-07-09|title=Technetium Tetrachloride Revisited: A Precursor to Lower-Valent Binary Technetium Chlorides|journal=Inorganic Chemistry|language=EN|volume=51|issue=15|pages=8462–8467|doi=10.1021/ic301011c|pmid=22775538|osti=1307429}}</ref>

:Tc + 2 Cl₂ → TcCl₄

Technetium tetrachloride has also been prepared from the reaction of [[technetium(VII) oxide]] with [[carbon tetrachloride]] in a sealed vessel at elevated temperature:<ref>{{cite book | last=Housecroft | first=Catherine E. | last2=Sharpe | first2=A. G. | title=Inorganic chemistry | publisher=Pearson Prentice Hall | publication-place=Upper Saddle River, N.J. | date=2005 | isbn=0-13-039913-2 | oclc=56834315|page=669}}</ref>

:Tc₂O₇ + 7 CCl₄ → 2 TcCl₄ + 7 COCl₂ + 3 Cl₂

At 450&nbsp;°C under vacuum, TcCl₄ decomposes to [[Technetium trichloride|TcCl₃]] and TcCl₂.<ref>{{cite journal |doi=10.1021/ar400225b|title=Recent Advances in Technetium Halide Chemistry|year=2014|last1=Poineau|first1=Frederic|last2=Johnstone|first2=Erik V.|last3=Czerwinski|first3=Kenneth R.|last4=Sattelberger|first4=Alfred P.|journal=Accounts of Chemical Research|volume=47|issue=2|pages=624–632|pmid=24393028}}</ref>

As verified by [[X-ray crystallography]], the compound is an inorganic polymer consisting of interconnected TcCl₆ octahedra.

{{Technetium compounds}}

{{Chlorides}}