Guanidinium
/ˌɡwɑː.nɪˈdɪn.i.əm/noun
The positively charged ion formed when guanidine accepts a proton.
Did you know?Guanidinium is the protonated form of guanidine, a strongly basic group found in arginine and central to many biological molecules.
Etymological Timeline
16th Century
Quechua/Spanish
wánu → guano
“Seabird or bat excrement, especially the nitrogen-rich material gathered as fertilizer in South America.”
19th Century
English
guanine
“A crystalline nitrogenous compound first associated with guano; its name was formed from guano.”
1830s–1840s
German/English
Guanin / guanine
“The purine base identified in biological materials, including guano and animal tissues.”
1861
English
guanidine
“A strongly basic nitrogen compound named in relation to guanine.”
Modern English
Chemistry
guanidinium
“The protonated, positively charged form of guanidine, commonly written [C(NH₂)₃]⁺.”