Transition metal chloride complex

Octahedral molecular geometry is a common structural motif for homoleptic metal chloride complexes. Examples include MCl6 (M = Mo, W), [MCl6] (M = Nb, Ta, Mo, W, Re), [MCl6]2- (M = Ti Zr, Hf, Mo, Mn, Re, Ir, Pd, Pt), and [MCl6]3- (M = Ru Os, Rh, Ir).

In chemistry, a transition metal chloride complex is a coordination complex that consists of a transition metal coordinated to one or more chloride ligand. The class of complexes is extensive.[1]

Bonding

Halides are X-type ligands in coordination chemistry. They are both σ- and π-donors. Chloride is commonly found as both a terminal ligand and a bridging ligand. The halide ligands are weak field ligands. Due to a smaller crystal field splitting energy, the homoleptic halide complexes of the first transition series are all high spin. Only [CrCl6]3− is exchange inert.

Homoleptic metal halide complexes are known with several stoichiometries, but the main ones are the hexahalometallates and the tetrahalometallates. The hexahalides adopt octahedral coordination geometry, whereas the tetrahalides are usually tetrahedral. Square planar tetrahalides are known for Pd(II), Pt(II), and Au(III). Examples with 2- and 3-coordination are common for Au(I), Cu(I), and Ag(I).

Due to the presence of filled pπ orbitals, halide ligands on transition metals are able to reinforce π-backbonding onto a π-acid. They are also known to labilize cis-ligands.[2] [3]

Homoleptic complexes

Homoleptic complexes (complexes with only chloride ligands) are often common reagents. Almost all examples are anions.

1st row

1st Transition Series
Complex colour electron config. structure geometry comments
TiCl4 colourless (t2g)0 tetrahedral
[Ti2Cl9] white/colourless d0d0 face-sharing bioctahedron Ti-Cl(terminal) = 2.23 Å, 2.45 (terminal)
(N(PCl3)2)+ salt)[4]
[Ti2Cl9]3- orange (t2g)1(t2g)1 face-sharing bioctahedron Ti-Ti =3.22 Å
Ti-C1(terminal) = 2.32-2.35 Å,
Ti-Cl(bridge) = 2.42-2.55 Å
((NEt4+)3)3 salt)[5]
[Ti2Cl10]2− colourless d0d0 bioctahedral
[Ti3Cl12]3- green (t2g)1(t2g)1(t2g)1 face-sharing trioctahedron Ti-Ti = 3.19, 3.10 Å (terminal)
Ti-C1(terminal) = 2.36 Å (terminal),
Ti-Cl(bridge) = 2.50 Å
((PPh4+)3)3 salt)[6]
[TiCl6]2− yellow d0 octahedral PPh4+ salt
Ti-Cl = 2.33 Å[7]
VCl4 red (t2g)1 tetrahedral V1−Cl = 2.29 Å
V2Cl10 violet (t2g)0 edge-shared bioctahedron V1−Cl(bridging) = 2.48 Å
V1−Cl(terminal) = 2.16-2.21 Å[8]
[VCl6]2- red (t2g)1 octahedral V1−Cl = 2.29 Å[9]
[CrCl6]3− pink[3] (t2g)3 octahedral[10][3]
[Cr2Cl9]3− red (d3)2 face-sharing bioctahedron Cr-Cl(terminal) = 2.31 Å, 2.42 (terminal)
(Et2NH2+ salt)[11]
[MnCl4]2−[12] pale pink to while (eg)2(t2g)3 tetrahedral Mn-Cl bond length = 2.3731-2.3830 Å[13]
[MnCl6]2− dark red (t2g)3(eg)1 octahedral Mn-Cl distance = 2.28 Å
K+ salt[14])
salt is isostructural with K2PtCl6
[MnCl6]3− brown[3] (t2g)3(eg)1 octahedral[10][3]
[Mn2Cl6]2− yellow-green (eg)2(t2g)3 bitetrahedral Mn-Cl(terminal) bond length = 2.24 Å
Mn-Cl(terminal) bond length = 2.39 Å[15]
(PPN+)2 salt
[Mn3Cl12]6− pink (t2g)3(eg)2 cofacial trioctahedron Mn-Cl distance = --- Å
[(C(NH2)3]+6 salt[16]
[FeCl4]2−[12] cream (eg)3(t2g)3 tetrahedral((Et4N+)2 salt)[12]
[FeCl4] (eg)2(t2g)3 tetrahedral Fe-Cl bond length = 2.19 Å[17]
[FeCl6]3− orange (t2g)3(eg)2 octahedral[3]
[Fe2Cl6]2− pale yellow (eg)2(t2g)3 bitetrahedral Fe-Cl(terminal) bond length = 2.24 Å
Fe-Cl(terminal) bond length = 2.39 Å[15]
(PPN+)2 salt
[CoCl4]2−[12] blue[12] (eg)4(t2g)3 tetrahedral
[Co2Cl6]2− blue[15] (eg)4(t2g)3 bitetrahedral Mn-Cl(terminal) bond length = 2.24 Å
Co-Cl(terminal) bond length = 2.35 Å[15]
(PPN+)2 salt
[NiCl4]2−[12] blue[12] (eg)4(t2g)4 tetrahedral Ni-Cl bond length = 2.28 Å
(Et4N+)2 salt[18]
[Ni3Cl12]6− orange[19] (t2g)6(eg)2 confacial trioctahedral ((Me2NH2+)2)8 salt
double salt with two Cl
Ni-Cl bond length = 2.36-2.38 Å[19]
[CuCl4]2−[12] orange[20]
yellow (flattened tetrahedral)[21]
green (square planar)[22]
(t2g)6(eg)3 flattened tetrahedral
or square planar[23][24]
Cu-Cl bond length = 2.24 Å
[Cu2Cl6]2− red [(t2g)6(eg)3]2 edge-shared bis(square planar)[25] Cu-Cl(terminal) = 2.24 Å
Cu-Cl(bridging) = 2.31 Å
[ZnCl4]2− white/colorless d10 tetrahedral

2nd row

Some homoleptic complexes of the second row transition metals feature metal-metal bonds.

2nd Transition Series
Complex colour electron config. structure geometry comments
[ZrCl6]2− yellow d0 octahedral Zr-Cl distance = 2.460 Å
(Me4N+)2 salt[27]
[Zr2Cl10]2− colorless (d0)2 edge-shared bioctahedral Zr-Cl = 2.36 Å (terminal), 2.43 Å (bridging)
N(PCl3)2)+ salt[4]
Nb2Cl10 yellow (d0)2 edge-shared bioctahedral [Nb2Cl10] 3.99 Å[28]
[NbCl6] yellow d0 octahedral Nb-Cl = 2.34 Å
N(PCl3)2)+ salt[4]
[Nb6Cl18]2− black (d2)4(d3)2 (14 cluster electrons) cluster Nb---Nb bonding Nb-Cl = 2.92 Å
(K+)2 salt[29]
MoCl6 black d0 octahedron Mo−Cl = 2.28 -2.31 Å[8]
[MoCl6]2− yellow (t2g)2 octahedron Mo−Cl = 2.37, 2.38, 2.27 Å[30]
[MoCl6]3− pink (t2g)3 octahedral
[Mo2Cl8]4− purple[31] 2(d4) Mo-Mo quadruple bond
[Mo2Cl9]3− 2(d3) face-shared bioctahedral Mo-Mo (triple) bond length = 2.65 Å
Mo-Cl (terminal) bond length = 2.38 Å
Mo-Cl (bridging) bond length = 2.49 Å[32][33]
Mo2Cl10 green (d1)2 edge-sharing bioctahedra[34]
[Mo2Cl10]2− (d2)2 edge-sharing bioctahedra[35]
[Mo5Cl13]2− brown[31] d2d2d2d2d3 incomplete octahedron[36]
[Mo6Cl14]2− yellow d4 octahedral cluster (4-HOPyH+)2 salt[37]
[TcCl6]2− yellow (t2g)3 octahedron Tc-Cl = 2.35 Å for As(C6H5)4+ salt[38]
[Tc2Cl8]2− green (t2g)4 Tc-Tc quadruple bond Tc-Tc = 2.16, Tc-Cl = 2.34 Å for NBu4+ salt[39]
[RuCl6]2− brown (t2g)4 octahedral (EtPPh3+)2 salt[40]
[Ru2Cl9]3− red [(t2g)5]2 cofacial bioctahedral Ru-Ru bond length = 2.71 Å; Ru-Cl(terminal) = 2.35 Å, Ru-Cl(bridging) = 2.36 Å ((Et4N)+)3 salt[41]
[Ru3Cl12]4− green (d5)2(d6) cofacial trioctahedral Ru-Ru bond lengths = 2.86 Å
Ru-Cl bond lengths = 2.37-2.39 Å
(Et4N+)2(H7O3+)2 salt[42]
[RhCl6]3− red (t2g)6 octahedral H2N+(CH2CH2NH3+)2 salt)[43]
[Rh2Cl9]3− red-brown (t2g)6 octahedral Rh-Cl(terminal) = 2.30 Å, Rh-Cl(terminal) = 2.40 Å
((Me3CH2Ph)+)3 salt)[32]
[PdCl4]2− brown d8 square planar
[Pd2Cl6]2−[44] red ((Et4N+)2 salt) d8 square planar
[Pd3Cl8]2−[45] orange brown ((Bu4N+)2 salt) d8 square planar
[PdCl6]2− brown d6 octahedral Pd(IV)
[Pd6Cl12] yellow-brown d8 square planar[46]
[AgCl2] white/colorless d10 linear salt of [K(2.2.2-crypt)]+[47]
[CdCl4]2− white/colorless d10 tetrahedral Et4N+ salt, Cd-Cl distance is 2.43 Å[26]
[Cd2Cl6]2− white/colorless d10 edge-shared bitetrahedron (C6N3(4-C5H4N)33+ salt[48]
[Cd3Cl12]6− white/colorless d10 octahedral (central Cd)
pentacoordinate (terminal Cd's)
cofactial trioctahedral
(C6N3(4-C5H4N)33+ salt[48]
(3,8-Diammonium-6-phenylphenanthridine3+)2[49]
[Cd6Cl19]7− white/colorless d10 octahedron of octahedra 4,4'-(C6H3(2-Et)NH3+)2 salt[50]

3rd row

3rd Transition Series
Complex colour electron config. structure geometry comments
[HfCl6]2− white d0 octahedral Hf-Cl distance = 2.448 A
((Me4N+)2 salt)[27]
[Hf2Cl10]2− colorless/white d0 edge-shared bioctahedral[51]
[Hf2Cl9] colorless/white (d0)2 face-shared bioctahedral[52]
[TaCl5] white d0 edge-shared bioctahedral
[TaCl6] white/colourless d0 octahedral Ta-Cl = 2.34 Å
(N(PCl3)2)+ salt)[4]
[Ta6Cl18]2- green d0 octahedral Ta-Ta = 2.34 Å
(H+2 salt hexahydrate[53]
WCl6 blue d0 octahedral 2.24–2.26 Å[54]
[WCl6]2− (t2g)2 octahedral W-Cl distances range from 2.34 to 2.37 Å
(PPh4+ salt)[55]
[WCl6] (t2g)1 octahedral W-Cl distance = 2.32 Å
(Et4N+ salt)[56]
W2Cl10 black[57] (t2g1)2 bioctahedral W-W distance = 3.814 Å[58]
[W2Cl8]4− blue 2(d4) W-W quadruple bond dW-W = 2.259 Å [Na(tmeda)+]4 salt[59]
[W2Cl9]2− d3d2 face-sharing bioctahedral W-W distance = 2.54 Å
W-Cl(terminal) = 2.36 Å, W-Cl(bridge) = 2.45 Å
((PPN+)2 salt)[60]
[W2Cl9]3− d3d3 octahedral W-Cl distance = 2.32 Å
(Et4N+ salt)[60]
[W3Cl13]3− d3,d3,d4 [W33-Cl)(μ-Cl)3Cl9]3- W-W distances = 2.84 Å[61]
[W3Cl13]2− d3,d4,d4 [W33-Cl)(μ-Cl)3Cl9]2-[61] W-W distances = 2.78 Å[61]
[W6Cl14]2- yellow[62] (d4)6 see Mo6Cl12
[ReCl6] red-brown (t2g)2 octahedral Re-Cl distance = 2.24-2.31 Å
(PPh4+ salt)[63]
[ReCl6] (t2g)1 octahedral Re-Cl distance = 226.3(6) Å[8]
[ReCl6]2− green (t2g)3 octahedral Re-Cl distance = 2.35-2.38 Å
((PPN+)2 salt)[64]
[Re2Cl9]2− (t2g)3(t2g)4 face-sharing bioctahedral Re-Re distance = 2.48 Å
Re-Cl distances = 2.42 Å (bridge), 2.33 Å (terminal)
((Et4N+)2 salt)[65]
[Re2Cl9] ((t2g)3)2 face-sharing bioctahedral Re-Re distance = 2.70 Å
Re-Cl distances = 2.41 (bridge), 2.28 Å (terminal)
(Bu4N+ salt)[65]
[OsCl6] dark green (t2g)3 octahedral dOs-Cl = 2.30 Å for Et4N+[66] and Ph4P+[67] salts
[OsCl6]2− yellow-orange (t2g)4 octahedral[67] Os-Cl distance 2.33 Å
[Os2Cl8]2− green (d5)2 square antiprism dOs-Os = 2.182 Å, dOs-Cl = 2.32 Å (Bu4N+)2 salt[68]
[Os2Cl10]2− green (d4)2 octahedral dOs-Cl(terminal) = 2.30 Å dOs-Cl(bridging) = 2.42 Å (Et4N+)2 salt[66]
[IrCl6]3− red (t2g)6 octahedral Ir-Cl = 2.36 Å[69]
[IrCl6]2− brown (t2g)5 octahedral Ir-Cl = 2.33 Å[70]
[Ir2Cl9]3− - ((t2g)6)2 bi-octahedral[71]
[PtCl4]2− pink d8 square planar
[PtCl6]2− yellow d6 octahedral Pt-Cl distance = 2.32 Å
Et4N+ salt, ((Me4N+)2 salt)[27]
[Pt2Cl9] red (Bu4N+ salt) ((t2g)6)2 octahedral Pt-Clt and Pt-Clbridge = 2.25, 2.38 Å[72]
[Pt2Cl10]2− yellow-brown (PPN+ salt) ((t2g)6)2 edge-shared bioctahedral Pt-Clt and Pt-Clbridge = 2.27, 2.37 Å[72]
[Pt6Cl12] yellow-brown (d8)6 square planar Pt-Cl = 2.31[73]
[AuCl2] white/colorless d10 linear Au-Cl distances of 2.28 Å
NEt4+ salt[74]
Au4Cl8 black (d10)2(d8)2 linear and square planar rare example of mixed valence, molecular chloride[75]
[AuCl4] yellow d8 square planar Au-Cl distances of 2.26 Å
NBu4+ salt[76]
[HgCl4]2− white/colorless d10 tetrahedral Hg-Cl distance is 2.46 Å[26]
Et4N+ salt
[Hg2Cl6]2− white/colorless d10 edge-shared bitetrahedral Hg-Cl distance is 2.46 Å[77]
Bu4N+ salt

Heteroleptic complexes

Heteroleptic complexes containing chloride are numerous. Most hydrated metal halides are members of this class. Hexamminecobalt(III) chloride and Cisplatin (cis-Pt(NH3)2Cl2) are prominent examples of metal-ammine-chlorides.

Hydrates

"Nickel dichloride hexahydrate" consists of the chloride complex trans-[NiCl2(H2O)4 plus water of crystallization.

As indicated in the table below, many hydrates of metal chlorides are molecular complexes.[78][79] These compounds are often important commercial sources of transition metal chlorides. Several hydrated metal chlorides are not molecular and thus are not included in this tabulation. For example the dihydrates of manganese(II) chloride, nickel(II) chloride, copper(II) chloride, iron(II) chloride, and cobalt(II) chloride are coordination polymers.

Formula of
hydrated metal halides
Coordination
sphere of the metal
TiCl3(H2O)6 trans-[TiCl2(H2O)4]+[80]
VCl3(H2O)6 trans-[VCl2(H2O)4]+[80]
CrCl3(H2O)6 trans-[CrCl2(H2O)4]+
CrCl3(H2O)6 [CrCl(H2O)5]2+
CrCl2(H2O)4 trans-[CrCl2(H2O)4]
CrCl3(H2O)6 [Cr(H2O)6]3+[81]
MnCl2(H2O)6 trans-[MnCl2(H2O)4]
MnCl2(H2O)4 cis-[MnCl2(H2O)4][82]
FeCl2(H2O)6 trans-[FeCl2(H2O)4]
FeCl2(H2O)4 trans-[FeCl2(H2O)4]
FeCl3(H2O)6 one of four hydrates of ferric chloride,[83]
FeCl3(H2O)2.5 cis-[FeCl2(H2O)4]+[84]
CoCl2(H2O)6 trans-[CoCl2(H2O)4]
CoCl2(H2O)4 cis-[CoCl2(H2O)4]
NiCl2(H2O)6 trans-[NiCl2(H2O)4]
NiCl2(H2O)4 cis-[NiCl2(H2O)4]

Adducts

Metal chlorides form adducts with ethers to give transition metal ether complexes.

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Skirt, HirariSingel oleh AKB48dari album Set List: Greatest Songs 2006–2007Sisi-BAozora no soba ni iteDirilis7 Juni 2006 (2006-06-07) (Indies)FormatCD SingelGenrePopDurasi18:19LabelAKSPenciptaYasushi Akimoto, Mio Okada, Yuichi YaegakiProduserYasushi Akimoto Skirt, Hirari (スカート、ひらりcode: ja is deprecated ) adalah singel kedua grup idola Jepang AKB48 yang dirilis secara independen oleh AKS, 7 Juni 2006.[1] Lagu ini dinyanyikan oleh 7 anggota dari Tim A AKB48, Tomomi I…

Sando三多Sando in 1925Amban of Outer MongoliaIn office1909–1911MonarchXuantong Emperor Personal detailsBorn1876Hangzhou, Zhejiang, Qing ChinaDied1941 (aged 64–65)OccupationQing Civil ServantMilitary serviceAllegiance Qing dynasty Sando (alternately Sanduo, San To, Sadowo; Chinese: 三多; pinyin: Sānduō; Mongolian: Сандо; 1876–1941), courtesy name Liuqiao (Chinese: 六橋), was an official of the Qing dynasty and later the Republic of China who most served as the …

Изобразительное искусство Башкортостана — статья об изобразительном искусстве Республики Башкортостана — живописи, графики, скульптуры и декоративно-прикладного искусства. Живопись Башкортостана может по праву претендовать на особое место в искусстве: она намно…

American singer-songwriter For the rugby union player, see Jimmy Bowen (rugby union). Jimmy BowenTrading card photo of Bowen in 1957; his last name is misspelled on the card.Background informationBirth nameJames Albert BowenBorn (1937-11-30) November 30, 1937 (age 86)Santa Rita, New Mexico, U.S.Genres Rockabilly[1] pop[1] Occupation(s)Record producer, singer, bassistYears activeEarly 1960s–presentMusical artist James Albert Bowen (born November 30, 1937)[2] is an A…

Voce principale: Promozione 1952-1953. Promozione Venezia Tridentina 1952-1953 Competizione Promozione Sport Calcio Edizione 1ª Organizzatore FIGCLega Regionale Venezia Tridentina Luogo  Italia Partecipanti 11 Formula 1 girone all'italiana Cronologia della competizione 1951-1952 1953-1954 Manuale La Promozione fu il massimo campionato regionale di calcio disputato in Trentino-Alto Adige nella stagione 1952-1953. La nuova massima categoria regionale presentava caratteristiche innovative, da…

Recording studio in London, England EMI Studios redirects here. For the film studios, see EMI-Elstree Studios. Abbey Road StudiosAbbey Road Studios in December 2005FormerlyEMI Recording StudiosCompany typeRecording studioIndustryMusicFoundedNovember 12, 1931; 92 years ago (1931-11-12)[1]FounderGramophone CompanyHeadquartersSt John's Wood, City of Westminster, London, EnglandParentUniversal Music Group (UMG)Websiteabbeyroad.com Abbey Road StudiosBuilt1829; 195…

Bellator mixed martial arts event in 2022 Bellator 280: Bader vs. Kongo 2The poster for Bellator 280: Bader vs. Kongo 2InformationPromotionBellator MMADateMay 6, 2022 (2022-May-06)VenueAccorHotels ArenaCityParis, FranceEvent chronology Bellator 279: Cyborg vs. Blencowe 2 Bellator 280: Bader vs. Kongo 2 Bellator 281: MVP vs. Storley Bellator 280: Bader vs. Kongo 2 was a mixed martial arts event produced by Bellator MMA that took place on May 6, 2022, at AccorHotels Arena in Paris, …

Olivola komune di Italia Tempat Negara berdaulatItaliaDaerah di ItaliaPiemonteProvinsi di ItaliaProvinsi Alessandria NegaraItalia PendudukTotal112  (2023 )GeografiLuas wilayah2,69 km² [convert: unit tak dikenal]Ketinggian280 m Berbatasan denganFrassinello Monferrato Ottiglio Vignale Monferrato Casorzo SejarahSanto pelindungSimon Petrus Informasi tambahanKode pos15030 Zona waktuUTC+1 UTC+2 Kode telepon0142 ID ISTAT006118 Kode kadaster ItaliaG042 Lain-lainSitus webLaman resmi Olivola ad…