:Gadolinium acetylacetonate

{{Chembox

| ImageFile1 = Gd(acac)3(H2O)2.svg

| ImageSize1 =

| IUPACName = gadolinium(3+);4-oxopent-2-en-2-olate

| Section1 = {{Chembox Identifiers

| CASNo = 14284-87-8

| CASNo_Comment = anhydrous

| CASNo1 = 47313-82-6

| CASNo1_Comment = dihydrate

| ChemSpiderID = 103881377

| EC_number = 238-186-2

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = WSR7UR34P3

| PubChem = 84317

| StdInChI=1S/3C5H7O2.Gd/c3*1-4(6)3-5(2)7;/h3*3H,1-2H3;/q3*-1;+3

| StdInChIKey=PJCXQIZIMGZZIT-UHFFFAOYSA-N

| SMILES = CC(=O)[CH-]C(=O)C.CC(=O)[CH-]C(=O)C.CC(=O)[CH-]C(=O)C.[Gd+3]

}}

| Section2 = {{Chembox Properties

| Gd = 1 | C = 15 | H = 21 | O = 6

| Appearance = Off-white

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| Section7 = {{Chembox Hazards

| GHS_ref={{cite web |title=Tris(pentane-2,4-dionato-O,O')gadolinium |url=https://pubchem.ncbi.nlm.nih.gov/compound/84317#section=Safety-and-Hazards |website=pubchem.ncbi.nlm.nih.gov |language=en}}

| GHSPictograms = {{GHS07}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|315|319|335}}

| PPhrases = {{P-phrases|261|264|264+265|271|280|302+352|304+340|305+351+338|319|321|332+317|337+317|362+364|403+233|405|501}}

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Gadolinium acetylacetonate is a coordination compound with the formula Gd(C₅H₇O₂)₃. This anhydrous acetylacetonate complex is widely discussed but unlikely to exist per se. The 8-coordinated dihydrate Gd(C₅H₇O₂)₃(H₂O)₂ is a more plausible formula based on the behavior of other lathanide complexes. It has also been characterized twice by X-ray crystallography.{{cite journal|journal=Gaodeng Xuexiao Huaxue Xuebao (Chem. J. Chin. Univ.(Chi)|year=1983|page=769|volume=4|first1=Shen |last1=Cheng|first2=Fan |last2 =Yuguo|first3=Liu|last3=Guofa|first4=Wang |last4=Yutian|first5=Lu|last5=Pinzhe }}Cambridge Crystallographic Data Center, number CCDC 1443363. H. Kooijman, A. L. Spek, W. Bult, F. Nijsen.

Upon heating under vacuum, the dihydrate converts to the oxo-cluster {{chem2|Gd4O(C5H7O2)10}}. This behavior is also observed for europium acetylacetonate, yttrium acetylacetonate, lanthanum acetylacetonate, and erbium acetylacetonate.{{cite journal| first1=Sem Raj | last1=Tamang| first2=Arpita| last2= Singh| first3=Deepika| last3= Bedi| first4=Adineh Rezaei| last4=Bazkiaei| first5=Audrey A.| last5=Warner| first6=Keeley | last6=Glogau| first7=Corey | last7=McDonald| first8=Daniel K. | last8=Unruh| first9=Michael| last9=Findlater|title=Polynuclear Lanthanide–Diketonato Clusters for the Catalytic Hydroboration of Carboxamides and Esters|journal=Nat. Catal.|volume= 3|pages= 154–162|year=2020| issue=2|doi=10.1038/s41929-019-0405-5}}