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The coinage metals comprise those metallic chemical elements and alloys which have been used to mint coins. Historically, most coinage metals are from the three nonradioactive members of group 11 of the periodic table: copper, silver and gold. Copper is usually augmented with tin or other metals to form bronze.
Group 11 is also known as the coinage metals, due to their usage in minting coins [2] —while the rise in metal prices mean that silver and gold are no longer used for circulating currency, remaining in use for bullion, copper remains a common metal in coins to date, either in the form of copper clad coinage or as part of the cupronickel alloy.
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As a result of the successful re-establishment of coinage in Indonesia, notes below 100 rupiah were withdrawn in Indonesia permanently from 1 September 1975 (at which point the exchange rate was fixed at 415 rupiah to the dollar, hence the largest denomination banknote to be withdrawn, the 50 rupiah note, was worth around US$0.10).
The Indonesian one thousand rupiah coin (Rp1,000) is a coin of the Indonesian rupiah.It circulates alongside the 1,000-rupiah banknote. First introduced on 8 March 1993 as bimetallic coins, they are now minted as unimetallic coins, with the first of its kind appearing in 2010 and its latest revision being in 2016.
As with the other coinage metals, the vast majority of the reported Au NHC complexes have a linear coordination geometry, although a higher coordination number of 4 has been observed for Au III. [1] Multinuclear complexes are also accessible, and have been synthesized to study Au-Au interactions during supramolecular aggregation. [ 9 ]
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