Copper(II) borate

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| Name = Copper(II) borate

| ImageFile = Copper(II) borate.JPG

| OtherNames = Cupric orthoborate

| IUPACName = Copper(II) borate

| Section1 = {{Chembox Identifiers

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| CASNo = 39290-85-2

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| PubChem = 170177

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| ChemSpiderID = 148800

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| EC_number = 254-401-2

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| UNII = HV7U2MWH9N

| SMILES = B([O-])([O-])[O-].B([O-])([O-])[O-].[Cu+2].[Cu+2].[Cu+2]

| InChI = 1S/2BO3.3Cu/c2*2-1(3)4;;;/q2*-3;3*+2

| InChIKey = CQDTUBLRLRFEJX-UHFFFAOYSA-N

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| Section2 = {{Chembox Properties

| Cu = 3 | B = 2 | O = 6

| Appearance = Dark green solid{{Cite journal |last1=Liu |first1=Jikai |last2=Wen |first2=Shuhao |last3=Zou |first3=Xiaoxin |last4=Zuo |first4=Fan |last5=Beran |first5=Gregory J. O. |last6=Feng |first6=Pingyun |date=2013 |title=Visible-light-responsive copper(II) borate photocatalysts with intrinsic midgap states for water splitting |journal=J. Mater. Chem. A |language=en |volume=1 |issue=5 |pages=1553–1556 |doi=10.1039/C2TA00522K |issn=2050-7488}}

| Density = 4.54

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| Solubility = Insoluble

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| Section3 = {{Chembox Structure

| CrystalStruct = Triclinic{{Cite journal |last1=Fukaya |first1=Atsuko |last2=Watanabe |first2=Isao |last3=Nagamine |first3=Kanetada |date=October 2001 |title=Long-Range Order in a Copper Borate Cu₃B₂O₆ |journal=Journal of the Physical Society of Japan |language=en |volume=70 |issue=10 |pages=2868–2871 |doi=10.1143/JPSJ.70.2868 |bibcode=2001JPSJ...70.2868F |issn=0031-9015}}

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| Section4 = {{Chembox Thermochemistry

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| NFPA-H = 0

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| GHSPictograms = {{GHS07}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|312|332|302|320|315}}

| PPhrases = {{P-phrases|280|301+312|302+352|304+340|305+351+338|332+313}}

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| Section6 = {{Chembox Related

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| OtherCations = Sodium orthoborate

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Copper(II) borate is an inorganic compound with the formula Cu₃(BO₃)₂. It consists of copper atoms in their cupric oxidation state and orthoborate groups. In the 19th century it was proposed to be used as a green pigment to replace the very toxic paris green.{{cite book |last1=Elsner |first1=L. |title=Die chemisch - technischen MITTHEILUNGEN der Jahre 1846–1848 |date=1849 |publisher=Julius Springer |location=Berlin |page=82}} It has been studied for it photocatalytic properties.