{"id":666980,"date":"2025-05-04T18:05:14","date_gmt":"2025-05-04T15:05:14","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/innovative-synthesis-technique-unlocks-new-class-of-planar-organometallic-compounds\/"},"modified":"2025-05-04T18:05:14","modified_gmt":"2025-05-04T15:05:14","slug":"innovative-synthesis-technique-unlocks-new-class-of-planar-organometallic-compounds","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/innovative-synthesis-technique-unlocks-new-class-of-planar-organometallic-compounds\/","title":{"rendered":"Innovative synthesis technique unlocks new class of planar organometallic compounds"},"content":{"rendered":"
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\n \"Innovative
\n Coordination chemistry of annulenes, porphyrin and related compounds. Credit: Nature (2025). DOI: https:\/\/doi.org\/10.1038\/s41586-025-08841-2
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With six Nobel Prizes in the category, organometallic chemistry has been a widely explored field since the 1950s. Yet, the discovery of new classes of organometallic compounds remains a rare occurrence.<\/p>\n

A team of researchers from China and the U.S. decided to change that by identifying a new class of organometallic compounds\u2014three new metal-centered planar annulene frameworks.<\/p>\n

Annulenes are cyclic hydrocarbons that contain the maximum number of alternating carbon\u2013carbon single and double bonds possible, with a general<\/a> formula Cn<\/sub>Hn<\/sub> for even numbers of n or Cn<\/sub>Hn + 1<\/sub> for odd numbers of n. The annulenes presented in this study were made up of 15 carbon atoms bonded to one atom of the transition metal osmium, at the center.<\/p>\n

The new compounds were reported<\/a> in Nature<\/i>.<\/p>\n

The mid-20th century saw the rise of a new field of chemistry called organometallics, kickstarted by the discovery of ferrocene\u2014a compound consisting of two five-carbon annulene rings sandwiching a central iron atom. In most organometallic compounds, a metal is \u03c0-coordinated where it sits above or below the plane of the flat annulene anions.<\/p>\n

Over the years, many such out-of-plane complexes have been synthesized, significantly influencing bonding theory and finding diverse app<\/a>lications in scientific and industrial processes thanks to their unique useful catalytic, electrochemical, and magnetic properties.<\/p>\n

However, not many in-plane metal-annulene complexes where the metal atom sits inside the ring and forms a \u03c3 (sigma) bond with the carbon atoms rather than \u03c0 bonds, have been reported.<\/p>\n

Synthesizing such complexes has proven far more challenging due to several factors: restrictions due to smaller annulene anions not having a large enough central cavity to accommodate a metal atom, larger annulenes deviating from planarity because of their flexible structures and the need to break strong carbon\u2013hydrogen bonds and replacing them with carbon\u2013metal bonds.<\/p>\n

The new study overcomes the synthetic obstacles to in-plane metallo-annulenes through targeted molecular design and a clever synthetic route. Instead of trying to insert a metal into an annulene, the researchers built an annulene framework around a metal center.<\/p>\n

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\n \"Innovative
\n Synthesis and characterization of metal-centered planar [15]annulenes. Credit: Nature (2025). DOI: https:\/\/doi.org\/10.1038\/s41586-025-08841-2
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The synthesis was carried out in multiple steps, starting with a molecular precursor containing a reactive osmium\u2013carbon trip<\/a>le bond and then assembling carbon\u2013carbon bonds around the metal atom via cycloaddition reaction. This led to the formation of in-plane [15]annulene metal complexes, containing five fused rings joined through the central osmium bis-phosphine moiety.<\/p>\n

The most symmetrical molecule designed in the study was a metallo-annulene made up of five connected five-membered aromatic rings. Using this as the parent structure, the researchers derived iodinated, chlorinated and nitrated version of the in-plane metallo-annulenes. They also found that the phosphine ligands of the parent moiety can be swapped out, offering a versatile platform for newer derivatives.<\/p>\n

The researchers highlight that the high stability of the metal-centered planar annulenes and their ability to be functionalized position them as promising building blocks for materials science<\/a>.<\/p>\n

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More information:<\/strong>
\n\t\t\t\t\t\t\t\t\t\t\t\tBinbin Xu et al, Metal-centred planar [15]annulenes, Nature<\/i> (2025). DOI: 10.1038\/s41586-025-08841-2<\/a><\/p>\n<\/p><\/div>\n

\n\t\t\t\t\t\t\t\t\t\t\t\t \u00a9 2025 Science X Network\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n

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\n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>:
\n\t\t\t\t\t\t\t\t\t\t\t\tInnovative synthesis technique unlocks new class of planar organometallic compounds (2025, May 3)
\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 4 May 2025
\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news<\/a>\/2025-05-synthesis-technique-class-planar-organometallic.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n

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