# Oxalate phosphate

The oxalate phosphates are chemical compounds containing oxalate and phosphate anions. They are also called oxalatophosphates or phosphate oxalates. Some oxalate-phosphate minerals found in bat guano deposits are known. Oxalate phosphates can form metal organic framework compounds.
Related compounds include the arsenate oxalates, and phosphite oxalates, oxalatomethylphosphonate, and potentially other oxalate phosphonates.

## List

| name | chem | mw | crystal system | space group | unit cell Å | volume | density | comment |
| Phoxite | (NH$_4$)$_2$Mg$_2$(C$_2$O$_4$)(PO$_3$OH)$_2$(H$_2$O)$_4$ | | monoclinic | P2$_1$/c | a=7.2962 b=13.5993 c=7.8334 β=108.271° Z=2 | 738.07 | 1.98 | mineral biaxial(-) α = 1.499, β = 1.541 γ = 1.542; 2V = 16 |
| Thebaite-(NH$_4$) | (NH$_4$,K)$_3$Al(C$_2$O$_4$)(PO$_3$OH)$_2$(H$_2$O) | | monoclinic | P2$_1$/c | a = 11.156, b = 6.234, c = 18.65, β = 102.93°, Z=4 | 1264 | 2.093 | biaxial (–) α = 1.490, β = 1.534, γ = 1.570; 2V = 82.7° |
| bis(N-methylpiperazinedi-ium) bis(bis(μ-dihydrogen phosphato)-(oxalato)-scandium) oxalate trihydrate | H$_2$mpip⋅Sc(H$_2$PO$_4$)$_2$(C$_2$O$_4$)·0.5C$_2$O$_4$·1.5H$_2$O | | | C2 | a=17.1307 b=6.6277 c=16.3543 β=103.336° | | | |
| Davidbrownite-(NH4) | (NH$_4$), (NH$_4$,K)5(V$^{4+}$O)$_2$(C$_2$O$_4$)[PO$_4$H]$_3$·[PO$_4$H$_2$]·3H$_2$O | | monoclinic | P2$_1$/c | a = 10.356, b = 8.923, c = 13.486, β = 92.618°, Z = 2 | 1244.9 | 2.12 | green–blue mineral biaxial (+) α = 1.540, β = 1.550 γ = 1.582; 2V = 58.5 |
| | (NH$_4$)$_2$[(VO)$_2$(HPO$_4$)$_2$C$_2$O$_4$]·5H$_2$O | | | | | | | |
| | Li$_2$(VO)$_2$(HPO$_4$)$_2$(C$_2$O$_4$) | | | | | | | |
| | Li$_2$(VO)$_2$(HPO$_4$)$_2$(C$_2$O$_4$)·6H$_2$O | 535.84 | triclinic | | a = 6.4133 b = 9.2173, c = 14.6206 α = 95.016°, β = 91.797°, γ = 107.7622°, and Z = 2 | 818.38 | 2.1743 | |
| | Na$_2$[(VO)$_2$(HPO$_4$)$_2$C$_2$O$_4$].2H$_2$O | | monoclinic | P2$_1$ | a = 6.3534, b = 17.1614, c = 6.5632, β = 106.59 | | | sheet morphology |
| | K$_2$[(VO)$_2$(HPO$_4$)$_2$(C$_2$O$_4$)] | 492.05 | triclinic | | a=6.316 b=7.489 c=10.861 α=56.8° β=57.99° γ=54.20° | | | |
| | K$_2$[(VO)$_2$(HPO$_4$)$_2$(C$_2$O$_4$)]·4.5H$_2$O | | triclinic | P1 | a = 6.3953, b = 9.1451, c = 14.6208, α = 97.269°, β = 91.351° γ = 106.500° Z=2 | | | |
| | K$_{2.5}$[(VO)$_2$(HPO$_4$)$_{1.5}$(PO$_4$)$_{0.5}$(C$_2$O$_4$)] | | | | | | | MOF |
| | LiK[(VO)$_2$(HPO$_4$)$_2$(C$_2$O$_4$)]·4.5H$_2$O | | | | | | | |
| | (C$_2$H$_{10}$N$_2$)[VO(HPO$_4$)]$_2$(C$_2$O$_4$) | 473.96 | triclinic | P1 | a = 6.3595, b = 6.6236, c = 9.224, α = 98.216$^o$, β = 108.128$^o$, γ = 100.672$^o$, Z = 1 | 354.42 | 2.225 | |
| guanidine vanadyl hydrogenphosphate oxalate | (CH$_6$N$_3$)$_2$[VO(HPO$_4$)]$_2$(C$_2$O$_4$) | 532.02 | triclinic | P1 | a = 6.3825, b = 7.8877, c = 9.202, α = 66.602$^o$, β = 71.757$^o$, γ = 79.821$^o$, Z = 1 | 403.07 | 2.192 | |
| catena-(4,4'-Bipyridinium bis(μ$_3$-hydrogen phosphato)-(μ$_2$-oxalato)-dioxo-di-vanadium) | (C$_{10}$H$_{10}$N$_2$)[(VO)(HPO$_4$)]$_2$(C$_2$O$_4$) | | monoclinic | P2$_1$/c | a=9.250 b=6.338 c=16.111, β=98.08° | | | |
| | K$_2$Mn$^{II}$$_2$(H$_2$O)$_2$C$_2$O$_4$(HPO$_3$)$_2$ | | | | | | | oxalophosphite |
| TREN = tris(2-aminoethyl)amine) | (H$_3$TREN)[Mn$_2$(HPO$_4$)(C$_2$O$_4$)$_{2.5}$]·3H$_2$O | | triclinic | P1 | a = 8.8385, b = 9.0586, c = 16.020, α = 77.616°, β = 83.359°, γ = 68.251°, and Z = 2. | | | |
| mpip1-methylpiperazine | (H$_2$mpip)$_{1.5}$•Mn$_3$(HPO$_4$)(H$_2$PO$_4$)(C$_2$O$_4$)2 | | | | | | | |
| dap=1,2-diaminopropane | (H$_2$dap)•Mn$_3$(HPO$_4$)(H$_2$PO$_4$)(C$_2$O$_4$)$_2$ | | | | | | | |
| pa=propylamine | (Hpa)•Mn$_3$(HPO$_4$)(H$_2$PO$_4$)(C$_2$O$_4$)$_2$ | | | | | | | |
| dmp = 1,4-dimethylpiperazine | (H$_2$dmp)$_{0.5}$·Mn(H$_2$PO$_4$)(C$_2$O$_4$) | | triclinic | P1 | a =5.8528 b =8.1833 c =11.1334, α =103.958° β =93.550° γ =90.572° | | | |
| TREN = tris(2-aminoethyl)amine) | (H$_3$TREN)[Fe$_2$(HPO$_4$)(C$_2$O$_4$)$_{2.5}$]·3H$_2$O | | triclinic | P1 | a = 8.7776, b = 8.9257, c = 15.884, α = 78.630°, β = 84.018°, and γ = 67.372° Z=2 | | | |
| 1,3-diaminopropane | [C$_3$H$_{12}$N$_2$]$_2$[Fe$_5$(C$_2$O$_4$)$_2$(H$_x$PO$_4$)$_8$] | 1367.31 | triclinic | P1 | a=9.7851 b=9.8986 c=10.7420 α =73.790 β = 71.684 γ = 79.300 Z=1 | 942.99 | 2.408 | |
| | Na$_2$Fe(C$_2$O$_4$)(HPO$_4$) | | monoclinic | P2$_1$/c | a=6.4728, b=20.210, c=10.4712 β=90.745 | 1369.7 | | orange |
| | K$_2$Fe(C$_2$O$_4$)(HPO$_4$)(OH$_2$) · H$_2$O | 354.08 | orthorhombic | Pbca | a=11.880 b=10.384 c=15.337 Z=8 | 1891.9 | 2.486 | yellow |
| | [NH$_3$(CH$_2$)$_3$NH$_3$][Zn$_6$(PO$_4$)$_4$(C$_2$O$_4$)] | 456.12 | triclinic | P1 | a =5.0030 b=8.5434 c=12.4336 α=92.99 β=97.138 γ = 91.465 Z=2 | 526.33 | 2.878 | |
| MIL-90 pentagallium sesquitrimethylenediamine difluoride dihydroxy oxalate tetraphosphate | Ga$_5$(PO$_4$)$_4$(C$_2$O$_4$)F$_2$(OH)$_2$·1.5N$_2$C$_3$H$_{12}$ | | triclinic | P1 | a = 8.1217, b = 8.9601, c = 10.4611, α = 111.930°, β = 103.655°, γ = 101.903° | 648.59 | | |
| NTHU-6 | 2(C$_{13}$H$_{16}$N$_2$) Ga$_{10}$ 8(PO$_4$)(HPO$_4$)$_4$(OH)$_2$(C$_2$O$_4$).3(H$_2$O) | 2251.61 | monoclinic | C2/m | a=23.048 b=24.649 c=17.081 β = 132.192 Z=4 | 7189.8 | 2.080 | yellow |
| 1,3-diaminopropane | [Ga$_2$(PO$_4$)$_2$(H$_2$O)(C$_2$O$_4$)$_{0.5}$](C$_3$N$_2$H$_{12}$)$_{0.5}$(H$_2$O) | | | | | | | |
| ethylene diamine | [Ga$_2$(PO$_4$)$_2$(C$_2$O$_4$)$_{0.5}$](C$_2$N$_2$H$_{10}$)$_{0.5}$(H$_2$O) | | | | | | | |
| 1,3-diaminopropane | [Ga$_2$(PO$_4$)$_2$(C$_2$O$_4$)$_{0.5}$](C$_3$N$_2$H$_{12}$)$_{0.5}$ | | | | | | | |
| diethylene triamine | [Ga$_2$(PO$_4$)$_2$(H$_2$PO$_4$)$_{0.5}$(C$_2$O$_4$)$_{0.5}$](C$_4$N$_3$H$_{16}$)$_{0.5}$ (H$_2$O)$_{1.5}$ | | | | | | | |
| diethylene triamine | [Ga$_{2.5}$(PO$_4$)$_{2.5}$(H$_2$O)$_{1.5}$(C$_2$O$_4$)$_{0.5}$](C$_4$N$_3$H$_{15}$)$_{0.5}$ | | | | | | | |
| dmpip = 2,6-dimethyl-piperazine catena-(bis(2,6-dimethylpiperazine-1,4-di-ium) bis(μ-hydrogen phosphato)-bis(μ-phosphato)-(μ-oxalato)-bis(hydrogen phosphato)-tetra-gallium dihydrate | [H$_2$dmpip][Ga$_2$(HPO$_4$)$_2$(PO$_4$)(C$_2$O$_4$)$_{0.5}$]·H$_2$O | | monoclinic | P2$_1$/c | a 8.904 b 28.036 c 8.173, β =100.74° | | | |
| catena-(2-(3-ammoniopropyl)propane-1,3-diammonium bis(μ$_4$-phosphato)-bis(μ$_3$-phosphato)-(μ$_2$-oxalato)-(μ$_2$-monohydrogen phosphato)-tetra-gallium dihydrate) | [C$_6$N$_3$H$_{19}$][Ga$_4$(C$_2$O$_4$)(PO$_4$)$_4$(H$_2$PO$_4$)]·2H$_2$O | | monoclinic | C2/c | a =20.355 b =15.649 c =9.0517 β =105.781° | | | |
| Piperazinediium bis(μ$_2$-oxalato-O,O',O'',O''')-bis(μ$_2$-hydrogen phosphato-O,O')-diaqua-di-indium dihydrate | [C$_4$N$_2$H$_{12}$]0.5In(HPO$_4$)(C$_2$O$_4$).H$_2$O | | monoclinic | P2$_1$/c | a =6.4726 b =11.080 c =14.311, β =100.316° | | | |
| Piperazinium bis(μ$_3$-monhydrogenphosphato)-(μ$_2$-monohydrogenphosphato)-(μ$_2$-oxalato)-di-indium monohydrate | [C$_4$H$_{12}$N$_2$][In$_2$(C$_2$O$_4$)(HPO$_4$)$_3$]·H$_2$O | | monoclinic | P2$_1$ | a =6.5052 b =17.5005 c =8.1811 β =107.656 | | | |
| dmp = 1,4-dimethylpiperazine bis(1,4-dimethylpiperazine-1,4-diium) bis(μ-oxalato)-tetrakis(μ-dihydrogen phosphato)-tetrakis(μ-hydrogen phosphato)-tetra-indium(iii) dihydrate | H$_2$dmp·In$_2$(HPO$_4$)$_2$(H$_2$PO$_4$)$_2$(C$_2$O$_4$)·H$_2$O | | | | a 7.9684 b 11.9582 c 12.5204, α 89.946° β 84.035° γ 87.287° | | | |
| dmapa = 3-(dimethylamino)-1-propylamine | H$_2$dmapa·In$_2$(HPO$_4$)$_2$(H$_2$PO$_4$)$_2$(C$_2$O$_4$)·H$_2$O | | | | a 7.8398 b 12.0428 c 12.4877, α 90.013° β 96.335° γ 92.640° | | | |
| | Cs$_2$Fe(C$_2$O$_4$)$_{0.5}$(HPO$_4$)$_2$ | | | | | | | |
| | CsFe(C$_2$O$_4$)$_{0.5}$(H$_2$PO$_4$)(HPO$_4$) | | | | | | | |
| APPIP = 1,4-bis(3-aminopropyl)piperazine | (H$_4$APPIP)[Er$_3$(C$_2$O$_4$)$_{5.5}$(H$_2$PO$_4$)$_2$]·5H$_2$O | | | | | | | |
| APPIP = 1,4-bis(3-aminopropyl)piperazine | (H$_4$APPIP)[Tm$_3$(C$_2$O$_4$)$_{5.5}$(H$_2$PO$_4$)$_2$]·5H$_2$O | | | | | | | |
| APPIP = 1,4-bis(3-aminopropyl)piperazine | (H$_4$APPIP)[Yb$_3$(C$_2$O$_4$)$_{5.5}$(H$_2$PO$_4$)$_2$]·5H$_2$O | | | | | | | |
| APPIP = 1,4-bis(3-aminopropyl)piperazine | (H$_4$APPIP)[Lu$_3$(C$_2$O$_4$)$_{5.5}$(H$_2$PO$_4$)$_2$]·5H$_2$O | | | | | | | |
| | K$_4$[Th(HPO$_4$)$_2$(C$_2$O$_4$)2(H$_2$O)$_2$]•4Н$_2$O | | | | | | | |
| Plutonium(IV) oxalatophosphate | ? | | | | | | | |