Chemistry:1,10-Phenanthroline

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Short description: Heterocyclic organic compound
Phenanthroline
1,10-phenanthroline
Sample of 1,10-Phenanthroline
Names
Preferred IUPAC name
1,10-Phenanthroline[1]
Identifiers
3D model (JSmol)
126461
ChEBI
ChEMBL
ChemSpider
DrugBank
EC Number
  • 200-629-2
  • monohydrate: 627-114-9
4040
KEGG
RTECS number
  • SF8300000
UNII
UN number 2811
Properties
C12H8N2
Molar mass 180.21 g/mol
Appearance colourless crystals
Density 1.31 g/cm3
Melting point 118.56 °C (245.41 °F; 391.71 K)[2]
Boiling point 409.2 [2]
high[2]
Solubility in other solvents acetone, ethanol[2]
Acidity (pKa) 4.84 (phenH+)[2]
Hazards
Main hazards mild neurotoxin, strong nephrotoxin, and powerful diuretic
GHS pictograms GHS06: ToxicGHS09: Environmental hazard
GHS Signal word Danger
H301, H410
P264, P270, P273, P301+310, P321, P330, P391, P405, P501
Related compounds
Related compounds
 2,2'-bipyridine
ferroin
phenanthrene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

1,10-Phenanthroline (phen) is a heterocyclic organic compound. It is a white solid that is soluble in organic solvents. The 1,10 refer to the location of the nitrogen atoms that replace CH's in the hydrocarbon called phenanthrene.

Abbreviated "phen", it is used as a ligand in coordination chemistry, forming strong complexes with most metal ions.[3][4] It is often sold as the monohydrate.

Synthesis

Phenanthroline may be prepared by two successive Skraup reactions of glycerol with o-phenylenediamine, catalyzed by sulfuric acid, and an oxidizing agent, traditionally aqueous arsenic acid or nitrobenzene.[5] Dehydration of glycerol gives acrolein which condenses with the amine followed by a cyclization.

Coordination chemistry

In terms of its coordination properties, phenanthroline is similar to 2,2'-bipyridine (bipy) with the advantage that the two nitrogen donors are preorganized for chelation. Phenanthroline is a stronger base than bipy. According to one ligand ranking scale, phen is a weaker donor than bipy.[6]

Several homoleptic complexes are known of the type [M(phen)3]2+. Particularly well studied is [Fe(phen)3]2+, called "ferroin." It can be used for the photometric determination of Fe(II).[7] It is used as a redox indicator with standard potential +1.06 V. The reduced ferrous form has a deep red colour and the oxidised form is light-blue.[8] The pink complex [Ni(phen)3]2+ has been resolved into its Δ and Λ isomers.[9] The complex [Ru(phen)3]2+ is bioactive.[10]

Copper(I) forms [Cu(phen)2]+, which is luminescent.[11][12]

Bioinorganic chemistry

1,10-Phenanthroline is an inhibitor of metallopeptidases, with one of the first observed instances reported in carboxypeptidase A.[13] Inhibition of the enzyme occurs by removal and chelation of the metal ion required for catalytic activity, leaving an inactive apoenzyme. 1,10-Phenanthroline targets mainly zinc metallopeptidases, with a much lower affinity for calcium.[14]

Related phen ligands

A variety of substituted derivatives of phen have been examined as ligands.[12][15] Substituents at the 2,9 positions confer protection for the attached metal, inhibiting the binding of multiple equivalents of the phenanthroline. Such bulky ligands also favor trigonal or tetrahedral coordination at the metal.[16] Phen itself form complexes of the type [M(phen)3]Cl2 when treated with metal dihalides (M = Fe, Co, Ni). By contrast, neocuproine and bathocuproine form 1:1 complexes such as [Ni(neocuproine)Cl2]2.[17]

Basicities of 1,10-Phenanthrolines and 2,2'-Bipyridine[18]
phen derivative pKa comment/alt. name numbering scheme
1,10-phenanthroline 4.86 phen Numbering for 1,10-phenanthroline derivatives.
2,2'-bipyridine 4.30 bipy
5-nitro-1,10-phenanthroline 3.57
2,9-dimethyl-1,10-phenanthroline unknown neocuproine[19][20]
2,9-Dimethyl-4,7-diphenylphenanthroline unknown Bathocuproine[19][21]
4,7-dimethyl-1,10-phenanthroline 5.97
4,7-diphenyl-1,10-phenanthroline unknown bathophenanthroline[22]
5,6-dimethyl-1,10-phenanthroline 5.20 5,6-Me2phen
3,4,7,8-tetramethylphenanthroline 6.31 3,4,7,8-Me4phen[23]
4,7-dimethoxy-1,10-phenanthroline 6.45 4,7-(MeO)2phen[24]
2,6-dimesitylphenanthroline unknown HETPHEN[25][16]

As an indicator for alkyllithium reagents

Alkyllithium reagents form deeply colored derivatives with phenanthroline. The alkyllithium content of solutions can be determined by treatment of such reagents with small amounts of phenanthroline (ca. 1 mg) followed by titration with alcohols to a colourless endpoint.[26] Grignard reagents may be similarly titrated.[27]

See also

References

  1. ↑ Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 211. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Haynes, William M., ed (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. p. 3.444. ISBN 9781498754293. 
  3. ↑ Luman, C.R. and Castellano, F.N. (2003) "Phenanthroline Ligands" in Comprehensive Coordination Chemistry II. Elsevier. ISBN:978-0-08-043748-4.
  4. ↑ Sammes, Peter G.; Yahioglu, Gokhan (1994). "1,10-Phenanthroline: A versatile ligand". Chemical Society Reviews 23 (5): 327. doi:10.1039/cs9942300327. 
  5. ↑ Halcrow, Barbara E.; Kermack, William O. (1946). "43. Attempts to find new antimalarials. Part XXIV. Derivatives of o-phenanthroline (7 : 8 : 3′ : 2′-pyridoquinoline)". J. Chem. Soc.: 155–157. doi:10.1039/jr9460000155. PMID 20983293. 
  6. ↑ Teng, Qiaoqiao; Huynh, Han Vinh (2017). "A Unified Ligand Electronic Parameter Based on C NMR Spectroscopy of N-Heterocyclic Carbene Complexes". Dalton Transactions 46 (3): 614–627. doi:10.1039/C6DT04222H. PMID 27924321. 
  7. ↑ Belcher R (1973). "Application of chelate Compounds in Analytical Chemistry". Pure and Applied Chemistry 34: 13–27. doi:10.1351/pac197334010013. 
  8. ↑ Bellér, G. B.; Lente, G. B.; Fábián, I. N. (2010). "Central Role of Phenanthroline Mono-N-oxide in the Decomposition Reactions of Tris(1,10-phenanthroline)iron(II) and -iron(III) Complexes". Inorganic Chemistry 49 (9): 3968–3970. doi:10.1021/ic902554b. PMID 20415494. 
  9. ↑ George B. Kauffman; Lloyd T. Takahashi (1966). "Resolution of the tris-(1,10-Phenanthroline)Nickel(II) Ion". Inorganic Syntheses. 5. pp. 227–232. doi:10.1002/9780470132395.ch60. ISBN 9780470132395. 
  10. ↑ Dwyer, F. P.; Gyarfas, Eleonora C.; Rogers, W. P.; Koch, Judith H. (1952). "Biological Activity of Complex Ions". Nature 170 (4318): 190–191. doi:10.1038/170190a0. PMID 12982853. Bibcode: 1952Natur.170..190D. 
  11. ↑ Armaroli N (2001). "Photoactive Mono- and Polynuclear Cu(I)-Phenanthrolines. A Viable Alternative to Ru(Ii)-Polypyridines?". Chemical Society Reviews 30 (2): 113–124. doi:10.1039/b000703j. 
  12. ↑ 12.0 12.1 Pallenberg A. J.; Koenig K. S.; Barnhart D. M. (1995). "Synthesis and Characterization of Some Copper(I) Phenanthroline Complexes". Inorganic Chemistry 34 (11): 2833–2840. doi:10.1021/ic00115a009. 
  13. ↑ Felber, Jean-Pierre; Coombs, Thomas L.; Vallee, Bert L. (1962). "The mechanism of inhibition of carboxypeptidase A by 1,10-phenanthroline". Biochemistry 1 (2): 231–238. doi:10.1021/bi00908a006. PMID 13892106. 
  14. ↑ Salvesen, GS; Nagase, H (2001). "Inhibition of proteolytic enzymes". in Beynon, Rob. Proteolytic Enzymes: A Practical Approach. 1 (2nd ed.). Oxford University Press. pp. 105–130. ISBN 9780199636624. 
  15. ↑ Accorsi, Gianluca; Listorti, Andrea; Yoosaf, K.; Armaroli, Nicola (2009). "1,10-Phenanthrolines: Versatile building blocks for luminescent molecules, materials and metal complexes". Chemical Society Reviews 38 (6): 1690–2300. doi:10.1039/B806408N. PMID 19587962. 
  16. ↑ 16.0 16.1 Somerville, Rosie J.; Odena, Carlota; Obst, Marc F.; Hazari, Nilay; Hopmann, Kathrin H.; Martin, Ruben (2020). "Ni(I)–Alkyl Complexes Bearing Phenanthroline Ligands: Experimental Evidence for CO2 Insertion at Ni(I) Centers". Journal of the American Chemical Society 142 (25): 10936–10941. doi:10.1021/jacs.0c04695. PMID 32520556. 
  17. ↑ Preston, H. S.; Kennard, C. H. L. (1969). "Crystal Structure of di-mu-Chloro-sym-trans-Dichloro-Bis-(2,9-Dimethyl-1,10-Phenanthroline)dinickel(II)-2-Chloroform". J. Chem. Soc. A: 2682–2685. doi:10.1039/J19690002682. 
  18. ↑ Leipoldt, J.G.; Lamprecht, G.J.; Steynberg, E.C. (1991). "Kinetics of the substitution of acetylacetone in acetylactonato-1,5-cyclooctadienerhodium(I) by derivatives of 1,10-phenantrholine and 2,2′-dipyridyl". Journal of Organometallic Chemistry 402 (2): 259–263. doi:10.1016/0022-328X(91)83069-G. 
  19. ↑ 19.0 19.1 Rezazadeh, Sina; Devannah, Vijayarajan; Watson, Donald A. (2017). "Nickel-Catalyzed C-Alkylation of Nitroalkanes with Unactivated Alkyl Iodides". Journal of the American Chemical Society 139 (24): 8110–8113. doi:10.1021/jacs.7b04312. PMID 28594543. 
  20. ↑ Nilsson, Peter (2012). "Neocuproine". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01440. ISBN 978-0471936237. 
  21. ↑ Liu, Guosheng; Wu, Yichen (2012). "Bathocuproine". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01392. ISBN 978-0471936237. 
  22. ↑ Vallée, Frédéric; Kühn, Fritz E.; Korinth, Valentina A. (2013). "Bathophenanthroline". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01319.pub2. ISBN 978-0471936237. 
  23. ↑ Zhu, Lingui; Altman, Ryan A. (2013). "3,4,7,8-Tetramethyl-1,10-phenanthroline (Tmphen)". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01515. ISBN 978-0471936237. 
  24. ↑ Altman, Ryan A. (2008). "Encyclopedia of Reagents for Organic Synthesis". eEROS. doi:10.1002/047084289X.rn00918. ISBN 978-0471936237. 
  25. ↑ Kohler, Lars; Hayes, Dugan; Hong, Jiyun; Carter, Tyler J.; Shelby, Megan L.; Fransted, Kelly A.; Chen, Lin X.; Mulfort, Karen L. (2016). "Synthesis, structure, ultrafast kinetics, and light-induced dynamics of CuHETPHEN chromophores". Dalton Transactions 45 (24): 9871–9883. doi:10.1039/c6dt00324a. PMID 26924711. 
  26. ↑ Fagan, Paul J.; Nugent, William A. (1998). "1-Phenyl-2,3,4,5-Tetramethylphosphole". Organic Syntheses. http://www.orgsyn.org/demo.aspx?prep=CV9P0653. ; Collective Volume, 9, pp. 653 
  27. ↑ Lin, Ho-Shen; Paquette, Leo A. (1994). "A Convenient Method for Determining the Concentration of Grignard Reagents". Synth. Commun. 24 (17): 2503–2506. doi:10.1080/00397919408010560. 



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