Linear chain compound explained

thumb|222px|right|Magnus's green salt is an example of a linear chain compound.

In chemistry and materials science, linear chain compounds are materials composed of one-dimensional arrays of metal-metal bonded molecules or ions. Such materials exhibit anisotropic electrical conductivity.^[1]

Examples

Most examples are composed of square planar complexes. Thus, upon crystallization, molecules of stack with distances of about 326 pm.^[2] Classic examples include Krogmann's salt and Magnus's green salt. Another example is the partially oxidized derivatives of . The otherwise ordinary complex gives an electrically conductive derivative upon oxidation, e.g., with bromine to give, where x ~0.05.^{[3] [4]} Related chlorides have the formulae and .^[5]

In contrast to linear chain compounds, extended metal atom chains (EMACs) are molecules or ions that consist of a finite, often short, linear strings of metal atoms, surrounded by organic ligands.^[6]

One group of platinum chains is based on alternating cations and anions of (R = iPr,,) and .^[1] These may be able to be used as vapochromic sensor materials, or materials which change color when exposed to different vapors.^{[7] [8] [9]}

Linear chains of Pd-Pd bonds protected by a "π-electron sheath" are known.^{[1] [10]}

Not only do these olefin-stabilized metal chains constitute a significant contribution to the field of organometallic chemistry, both the complex's metal atom structures and the olefin ligands themselves can conduct a current.^{[1] [11]}

Methodology

Some linear chain compounds are produced or fabricated by electrocrystallization. The technique is used to obtain single crystals of low-dimensional electrical conductors.^[12]

See also

• platinum pop

References

1. Bera, J. K. . Dunbar, K. R. . . 2002 . 41 . 23 . 4453–4457 . Chain Compounds Based on Transition Metal Backbones: New Life for an Old Topic . 10.1002/1521-3773(20021202)41:23<4453::AID-ANIE4453>3.0.CO;2-1 . 12458505.
2. Refinement of the crystal structure of acetylacetonatodicarbonylrhodium(I). Huq. Fazlul. Skapski. Andrzej C.. J. Cryst. Mol. Struct.. 1974. 4. 6. 411–418. 10.1007/BF01220097. 96977904.
3. Book: 10.1007/978-1-4613-3249-7. Extended Linear Chain Compounds. Miller. Joel S.. Joel S. Miller. 1982. Springer-Verlag. 978-1-4613-3251-0.
4. 10.1016/j.poly.2015.09.050. Revisiting Ir(CO)3Cl. 2016. Tsuji. Yuta. Hoffmann. Roald. Miller. Joel S.. Polyhedron. 103. 141–149. free.
5. Book: 10.1002/9780470132500.ch5. Inorganic Syntheses. 2007. Ginsberg. A. P.. Koepke. J. W.. Sprinkle. C. R.. Linear-Chain Iridium Carbonyl Halides . 18–22. 19. 9780470132500.
6. F. Albert Cotton, Carlos A. Murillo, Richard A. Walton (eds.), Multiple Bonds Between Metal Atoms, 3rd edition, Springer (2005)
7. Grate, J. W. . Moore, L. K. . Janzen, D. E. . Veltkamp, D. J. . Kaganove, S. . Drew, S. M. . Mann, K. R. . . 2002 . 14 . 3 . 1058–1066 . Steplike Response Behavior of a New Vapochromic Platinum Complex Observed with Simultaneous Acoustic Wave Sensor and Optical Reflectance Measurements . 10.1021/cm0104506 .
8. Buss, C.E. . Mann, K.R. . . 2002 . 124 . 6 . 1031–1039 . Synthesis and Characterization of Pt(CN\-p\-(C2H5)C6H4)2(CN)2, a Crystalline Vapoluminescent Compound That Detects Vapor-Phase Aromatic Hydrocarbons . 10.1021/ja011986v . 11829612 .
9. Buss, C.E. . Anderson, C.E. . Pomije, M. K. . Lutz, C. M. . Britton, D. . Mann, K. R. . . 1998 . 120 . 31 . 7783–7790 . Structural Investigations of Vapochromic Behavior. X-ray Single-Crystal and Powder Diffraction Studies of [Pt(CN\-''iso''\-C3H7)4][M(CN)4] for M = Pt or Pd . 10.1021/ja981218c .
10. Y. Mino. E. Mochizuki. Y. Kai. H. Kurosawa . . 2001 . 123 . 28 . 6927–6928 . Reversible Interconversion between Dinuclear Sandwich and Half-Sandwich Complexes: Unique Dynamic Behavior of a Pd-Pd Moiety Surrounded by an sp²-Carbon Framework . 10.1021/ja010027y .
11. Murahashi. T. Nagai. Okuno, T. Matsutani. T. Kurosawa. H. . . 2000 . 17 . 1689–1690 . Synthesis and ligand substitution reactions of a homoleptic acetonitrile dipalladium(I) complex . 10.1039/b004726k .
12. Book: Williams . 1989. Jack M . Inorganic Syntheses. 26 . 386–394 . 10.1002/9780470132579.ch70 . 978-0-470-13257-9 . Highly Conducting and Superconducting Synthetic Metals .