Zinc(I) compounds are rare and need bulky ligands to stabilize the low oxidation state. Most zinc(I) compounds contain formally the [Zn 2 ] 2+ core, which is analogous to the [Hg 2 ] 2+ dimeric cation present in mercury (I) compounds. The diamagnetic nature of the ion confirms its dimeric structure. The first zinc(I) compound containing the Zn–Zn bond, (η 5 -C 5 Me 5 ) 2 Zn 2 , is also the first dimetallocene . The [Zn 2 ] 2+ ion rapidly disproportionates into zinc metal and zinc(II), and has been obtained only a yellow glass only by cooling a solution of metallic zinc in molten ZnCl 2 . 
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Welcome to ZINC, a free database of commercially-available compounds for virtual screening. ZINC contains over 35 million purchasable compounds in ready-to-dock, 3D formats. ZINC is provided by the Irwin and Shoichet Laboratories in the Department of Pharmaceutical Chemistry at the University of California, San Francisco (UCSF). To cite ZINC, please reference: Irwin, Sterling, Mysinger, Bolstad and Coleman, J. Chem. Inf. Model. 2012 DOI: /ci3001277 . The original publication is Irwin and Shoichet, J. Chem. Inf. Model. 2005;45(1):177-82 PDF , DOI . We thank NIGMS for financial support (GM71896). Search: