Transition metal pyridine complexes

Structure of [Ru(NH3)5py]2+, illustrating the steric avoidance of the 2,6-protons and the cis ligands.[1]

Transition metal pyridine complexes encompass many coordination complexes that contain pyridine as a ligand. Most examples are mixed-ligand complexes. Many variants of pyridine are also known to coordinate to metal ions, such as the methylpyridines, quinolines, and more complex rings.

Bonding

With a pKa of 5.25 for its conjugate acid, pyridine is about 15x less basic than imidazole. Pyridine is a weak pi-acceptor ligand. Trends in the M-N distances for complexes of the type [MCl2(py)4]2+ reveal an anticorrelation with d-electron count.[2] Few low-valent metal complexes of pyridines are known. The role of pyridine as a Lewis base extends also to main group chemistry. Examples include sulfur trioxide pyridine complex SO3(py) and pyridine adduct of borane, BH3py.

Classification of metal-pyridine complexes

Many metal pyridine complexes are known. These complexes can be classified according to their geometry, i.e. octahedral, tetrahedral, linear, etc.

Octahedral complexes

trans-[MCl2(pyridine)4]n+ is a common type of transition metal pyridine complex.
Chloro(pyridine)cobaloxime.
Crabtree's catalyst.

Owing to the relatively wide C-N-C angle, the 2,6-hydrogen atoms interfere with the formation of [M(py)6]z complexes. A few octahedral homoleptic pyridine complexes are known. These complex cations are found in the salts [Ru(py)6]Fe4(CO)13 and [Ru(py)6](BF4)2.[3][4] Some compounds with the stoichiometry M(py)6(ClO4)2 have been reformulated as [M(py)4(ClO4)2].(py)2 [5]

A common family of pyridine complexes are of the type [MCl2(py)4]n+. The chloride ligands are mutually trans in these complexes.

MCl2(pyridine)4 complexes
formula CAS RN key properties Preparation
TiCl2(pyridine)4 131618-68-3 blue, triplet
dTi-N=2.27 Å, dTi-Cl = 2.50 Å (thf solvate)[6]		 TiCl3(thf)3 + KC8 + py[7]
VCl2(pyridine)4 15225-42-0 purple[8] VCl3 + Zn + py[9]
CrCl2(pyridine)4 51266-53-6 green
dCr-Cl = 2.80 Å dCo-Cl = 2.16 Å 		CrCl2 + py[10]
MnCl2(pyridine)4 14638-48-3 1.383
FeCl2(pyridine)4 15138-92-8 yellow
dFe-Cl = 2.43 Å		 FeCl2 + py[2]
CoCl2(pyridine)4 13985-87-0 blue
dCo-Cl = 2.44 Å		 CoCl2 + py[2]
[CoCl2(pyridine)4]Cl 27883-34-7 green (hexahydrate)
dCo-Cl = 2.25 Å, dCo-N = 1.98 Å[11]
as [CoCl3(py)]− salt		 CoCl2(pyridine)4 + Cl2[12]
NiCl2(pyridine)4 14076-99-4 blue
dNi-Cl = 2.44 Å		 NiCl2 + py[2]
NbCl2(pyridine)4 168701-43-7 dNb-N = 2.22 Å, dNb-Cl = 2.51 Å NbCl4(thf)2 + KC8 + py[6]
[MoCl2py)4]Br3 Br3− salt[13] yellow
dMo-Cl= 2.41 Å, dMo-N=2.20 Å
TcCl2py)4 172140-87-3 purple
dTc-Cl = 2.41 Å, dTc-N = 2.10 Å[14]		 TcCl4py2 + Zn + py
RuCl2(pyridine)4 16997-43-6 red-orange
dRu-N=2.08 Å, dRu-Cl=2.40 Å		 RuCl3(H2O)x + py [15]
[RhCl2(pyridine)4]+ 14077-30-6 (Cl− salt) yellow RhCl3(H2O)3 + py + cat. reductant[16]
OsCl2(pyridine)4 137822-02-7 brown
dOs-Cl = 2.40 Å, dOs-N= 2.068 Å		 K3OsCl6 + py + (CH2OH)2/140 °C[17]
[IrCl2(pyridine)4]+ yellow
1.35 Å (chloride.hexahydrate)[18]

The tris(pyridine) trihalides, i.e., [MCl3(py)3] (M = Ti, Cr, Rh[19] Ir), are another large class of M-Cl-py complexes.

Four-coordinate complexes

Collins reagent, the complex CrO3(pyridine)2, is a reagent in organic chemistry.[20]

Four-coordinate complexes include tetrahedral and square planar derivatives. Examples of homoleptic tetrahedral complexes include [M(py)4]n+ for Mn+ = Cu+,[21] M = Ni2+,[22] Ag+,[23] and Ag2+.[24] Examples of homoleptic square planar complexes include the d8 cations [M(py)4]n+ for Mn+ = Pd2+,[25] Pt2+,[26] Au3+.[27]

Ni(ClO4)2(3-picoline)2 can be isolated in two isomers, yellow, diamagnetic square planar or blue, paramagnetic tetrahedral.[28]

Mn(II) and Co(II) form both tetrahedral MCl2py2 and octahedral MCl2py4 complexes, depending on conditions:[29]

MCl2py2 + 2 py → MCl2py4

Two- and three-coordinate complexes

Many examples exist for [Au(py)2]+.[27] [Ag(py)3]+ and [Cu(py)2]+ are also precedented.[30][27]

Pi-complexes

The η6 coordination mode, as occurs in η6 benzene complexes, is observed only in sterically encumbered derivatives that block the nitrogen center.[31]

Picolines

Many substituted pyridines function as ligands for transition metals. The monomethyl derivatives, the picolines (2-, 3-, and 4-picoline), are best studied. 2-Picolines are sterically impeded from coordination.[28]

2,2'-bipy

Coupling of two pyridine rings at their 2-positions gives 2,2'-bipyridine, a widely studied bidentate ligand. A number of differences are apparent between pyridine and bipyridine complexes. Many [M(bipy)3]z complexes are known, whereas analogous [M(py)6]z complexes are rare and apparently labile. Bipyridine is a redox-noninnocent ligand, as illustrated by the existence of complexes such as [Cr(bipy)3]0. The pyridine analogues of such complexes are unknown. The dichloro complexes [MCl2(bipy)2]n+ tend to be cis, as exemplified by RuCl2(bipy)2. In contrast, the complexes [MCl2(py)4]n+ are always trans.

Imidazoles

Imidazoles comprise another major series of N-heterocyclic ligands. Unlike pyridines, imidazole derivatives are common ligands in nature.

Applications and occurrence

Crabtree's catalyst, a popular catalyst for hydrogenations, is a pyridine complex.

Although transition metal pyridine complexes have few practical applications, they are widely used synthetic precursors. Many are anhydrous, soluble in nonpolar solvents, and susceptible to alkylation by organolithium and Grignard reagents. Thus CoCl2(py)4 has proven very useful in organocobalt chemistry[32][33] and NiCl2(py)4 useful in organonickel chemistry.[34]

References

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  2. ^ a b c d Long, Gary J.; Clarke, Peter J. (1978). "Crystal and Molecular Structures of trans-Tetrakis(pyridine)dichloroiron(II), -Nickel(II), and -Cobalt(II) and trans-Tetrakis(pyridine)dichloroiron(II) Monohydrate". Inorganic Chemistry. 17 (6): 1394–1401. doi:10.1021/ic50184a002.
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Vektor Euklides

Sebuah vektor dari A ke B. Vektor spasial atau vektor Euclides; biasa disebut vektor dalam matematika dan fisika adalah objek geometri yang memiliki besar dan arah.[1] Vektor dilambangkan dengan tanda panah (→). Besar vektor proporsional dengan panjang panah dan arahnya bertepatan dengan arah panah. Vektor dapat melambangkan perpindahan dari titik A ke B.[2] Vektor sering ditandai sebagai A B → . {\displaystyle {\overrightarrow {AB}}.} [3] Sistem koordinat dig...

 

Epsilon

Fifth letter of the Greek alphabet Not to be confused with Upsilon. This article is about the Greek letter. For other uses, see Epsilon (disambiguation) and E (disambiguation). Greek alphabet Αα Alpha Νν Nu Ββ Beta Ξξ Xi Γγ Gamma Οο Omicron Δδ Delta Ππ Pi Εε Epsilon Ρρ Rho Ζζ Zeta Σσς Sigma Ηη Eta Ττ Tau Θθ Theta Υυ Upsilon Ιι Iota Φφ Phi Κκ Kappa Χχ Chi Λλ Lambda Ψψ Psi Μμ Mu Ωω Omega History Archaic local variants Ϝ Digamma Ͱ Heta Ϻ San Ϙ...