Rubidium β-diketonates were proposed as potential precursors for the growth of Rb-containing thin films by MOCVD or ALD. [[i]]
[i] R. G. Gordon, US Patent US 6,258,157 B1, Jul. 10, 2001
https://patentimages.storage.googleapis.com/10/ac/b4/c1fe802fa1385d/US6258157.pdf
Rubidium (I) acetylacetonate (or rubidium 2,4-pentanedionate) Rb(acac) (RbC5H7O2, M= 184.58) was synthesized and characterized. Rb(acac) is white solid , having melting point 200°C. [i]
Evidence for strong ion association/ ion-pair formation in Rb(acac) was revealed. (same as in analogous Li, Na, K and Cs acetylacetonates).[[ii]
[i] https://www.americanelements.com/rubidium-acetylacetonate-66169-93-5
[ii] C.R. Bhattacharjee, M. Bhattacharjee ; M.K. Chaudhuri, H. Sangchungnunga, J. Chem. Res. Synopses, 1991, no9, pp. 250-251 “ First synthesis of (acetylacetonato)rubidium(I), a direct route to (acetylacetonato)caesium(I) and evidence for strong ion association/ion-pair formation in M(acac) (M=Li, Na, K, Rb or Cs)”
[ii] O. Aschenbrenner, S. Kemper, N. Dahmen, K. Schaber, E. Dinjus, J. Supercritical Fluids, 2007, Vol.41, Iss.2, p. 179–186, “Solubility of β-diketonates, cyclopentadienyls, and cyclooctadiene complexes with various metals in supercritical carbon dioxide”