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  • 1
    Online Resource
    Online Resource
    A Boron-Boron Triple Bond
    American Association for the Advancement of Science (AAAS) ; 2012
    In:  Science Vol. 336, No. 6087 ( 2012-06-15), p. 1394-1395
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 336, No. 6087 ( 2012-06-15), p. 1394-1395
    Abstract: Although carbon readily forms double and even triple bonds, such bonds are much rarer between the heavier elements of the same group or between atoms of other main groups of the periodic system. Chemists have succeeded in creating some such molecules, such as double-bonded silicon compounds, although they are usually highly reactive. On page 1420 of this issue, Braunschweig et al. ( 1 ) report the synthesis of one such highly unusual chemical compound, which has a boron-boron triple bond.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1224003
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2012
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  • 2
    Online Resource
    Online Resource
    A Crystalline Singlet Phosphinonitrene: A Nitrogen Atom–Transfer Agent
    American Association for the Advancement of Science (AAAS) ; 2012
    In:  Science Vol. 337, No. 6101 ( 2012-09-21), p. 1526-1528
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 337, No. 6101 ( 2012-09-21), p. 1526-1528
    Abstract: A variety of transition metal–nitrido complexes (metallonitrenes) have been isolated and studied in the context of modeling intermediates in biological nitrogen fixation by the nitrogenase enzymes and the industrial Haber-Bosch hydrogenation of nitrogen gas into ammonia. In contrast, nonmetallic nitrenes have so far only been spectroscopically observed at low temperatures, despite their intermediacy in a range of organic reactions. Here, we report the synthesis of a bis(imidazolidin-2-iminato)phosphinonitrene, which is stable at room temperature in solution and can even be isolated in the solid state. The bonding between phosphorus and nitrogen is analogous to that observed for metallonitrenes. We also show that this nitrido phosphorus derivative can be used to transfer a nitrogen atom to organic fragments, a difficult task for transition metal–nitrido complexes.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1226022
    RVK:
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    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2012
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    detail.hit.zdb_id: 2060783-0
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  • 3
    Online Resource
    Online Resource
    The six-bond bound
    Springer Science and Business Media LLC ; 2007
    In:  Nature Vol. 446, No. 7133 ( 2007-3), p. 276-277
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 446, No. 7133 ( 2007-3), p. 276-277
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/446276a
    RVK:
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    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2007
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    detail.hit.zdb_id: 1413423-8
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  • 4
    Online Resource
    Online Resource
    Response to Comment on “Observation of alkaline earth complexes M(CO) 8 (M = Ca, Sr, or Ba) that mimic transition metals”
    American Association for the Advancement of Science (AAAS) ; 2019
    In:  Science Vol. 365, No. 6453 ( 2019-08-09)
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 365, No. 6453 ( 2019-08-09)
    Abstract: Landis et al . claim in their comment that Ca does not bind like a transition metal in Ca(CO) 8 . We reject their statement, which is based on a misconception of bonding models and misleading application and interpretation of quantum chemical methods for analyzing chemical bonds.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.aay5021
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    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2019
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  • 5
    Online Resource
    Online Resource
    Isolation of a C5-Deprotonated Imidazolium, a Crystalline “Abnormal” N-Heterocyclic Carbene
    American Association for the Advancement of Science (AAAS) ; 2009
    In:  Science Vol. 326, No. 5952 ( 2009-10-23), p. 556-559
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 326, No. 5952 ( 2009-10-23), p. 556-559
    Abstract: The discovery two decades ago of metal-free stable carbenes, especially imidazol-2-ylidenes [N-heterocyclic carbenes (NHCs)], has led to numerous breakthroughs in organic and organometallic catalysis. More recently, a small range of complexes has been prepared in which alternative NHC isomers, namely imidazol-5-ylidenes (also termed abnormal NHCs or a NHCs, because the carbene center is no longer located between the two nitrogens), coordinate to a transition metal. Here we report the synthesis of a metal-free a NHC that is stable at room temperature, both in the solid state and in solution. Calculations show that the a NHC is more basic than its normal NHC isomer. Because the substituent at the carbon next to the carbene center is a nonbulky phenyl group, a variety of substitution patterns should be tolerated without precluding the isolation of the corresponding a NHC.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1178206
    RVK:
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    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2009
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    SSG: 11
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  • 6
    Online Resource
    Online Resource
    Observation of alkaline earth complexes M(CO) 8 (M = Ca, Sr, or Ba) that mimic transition metals
    American Association for the Advancement of Science (AAAS) ; 2018
    In:  Science Vol. 361, No. 6405 ( 2018-08-31), p. 912-916
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 361, No. 6405 ( 2018-08-31), p. 912-916
    Abstract: The alkaline earth metals calcium (Ca), strontium (Sr), and barium (Ba) typically engage in chemical bonding as classical main-group elements through their n s and n p valence orbitals, where n is the principal quantum number. Here we report the isolation and spectroscopic characterization of eight-coordinate carbonyl complexes M(CO) 8 (where M = Ca, Sr, or Ba) in a low-temperature neon matrix. Analysis of the electronic structure of these cubic O h -symmetric complexes reveals that the metal–carbon monoxide (CO) bonds arise mainly from [M(d π )] → (CO) 8 π backdonation, which explains the strong observed red shift of the C-O stretching frequencies. The corresponding radical cation complexes were also prepared in gas phase and characterized by mass-selected infrared photodissociation spectroscopy, confirming adherence to the 18-electron rule more conventionally associated with transition metal chemistry.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.aau0839
    RVK:
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    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2018
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  • 7
    Online Resource
    Online Resource
    Building a Quintuple Bond
    American Association for the Advancement of Science (AAAS) ; 2005
    In:  Science Vol. 310, No. 5749 ( 2005-11-04), p. 796-797
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 310, No. 5749 ( 2005-11-04), p. 796-797
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1120281
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2005
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    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
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  • 8
    Online Resource
    Online Resource
    Another noble gas conquered
    Springer Science and Business Media LLC ; 2000
    In:  Nature Vol. 406, No. 6798 ( 2000-8), p. 836-837
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 406, No. 6798 ( 2000-8), p. 836-837
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/35022678
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2000
    detail.hit.zdb_id: 120714-3
    detail.hit.zdb_id: 1413423-8
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  • 9
    Online Resource
    Online Resource
    Peculiar boron startles again
    Springer Science and Business Media LLC ; 2015
    In:  Nature Vol. 522, No. 7556 ( 2015-6), p. 297-298
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 522, No. 7556 ( 2015-6), p. 297-298
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/522297a
    RVK:
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    RVK:
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    RVK:
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    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2015
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    detail.hit.zdb_id: 1413423-8
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  • 10
    Online Resource
    Online Resource
    Synthesis and Characterization of a Neutral Tricoordinate Organoboron Isoelectronic with Amines
    American Association for the Advancement of Science (AAAS) ; 2011
    In:  Science Vol. 333, No. 6042 ( 2011-07-29), p. 610-613
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 333, No. 6042 ( 2011-07-29), p. 610-613
    Abstract: Amines and boranes are the archetypical Lewis bases and acids, respectively. The former can readily undergo one-electron oxidation to give radical cations, whereas the latter are easily reduced to afford radical anions. Here, we report the synthesis of a neutral tricoordinate boron derivative, which acts as a Lewis base and undergoes one-electron oxidation into the corresponding radical cation. These compounds can be regarded as the parent borylene (H-B:) and borinylium (H-B +. ), respectively, stabilized by two cyclic (alkyl)(amino)carbenes. Ab initio calculations show that the highest occupied molecular orbital of the borane as well as the singly occupied molecular orbital of the radical cation are essentially a pair and a single electron, respectively, in the p(π) orbital of boron.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1207573
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2011
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    SSG: 11
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