| class="wikitable"
!formula
!name
!structure
!Remarks
!references |
| Rb3[Ni(NO2)5]
|trirubidium pentanitronickelate(II)
|
|
|[{{cite journal|last1=Hathaway|first1=B. J.|last2=Slade|first2=R. C.|title=The properties of trirubidium pentanitronickelate(II)|journal=Journal of the Chemical Society A: Inorganic, Physical, Theoretical|date=1966|pages=1485|doi=10.1039/J19660001485}}] |
| Cs3[Ni(NO2)5]
|tricaesium pentanitronickelate(II)
|
|dark red, formed from caesium nitrite and nickel nitrite in water
|[{{cite journal|last1=Goodgame|first1=David M. L.|last2=Hitchman|first2=M. A.|title=Spectroscopic studies of some compounds with octahedral polynitrite anions|journal=Inorganic Chemistry|date=April 1967|volume=6|issue=4|pages=813–816|doi=10.1021/ic50050a034}}] |
| K3[Ni(NO2)5]·KNO2
|potassium pentanitronickelate potassium nitrite
|monoclinic, a = 7.240 Å, b = 10.946 Å, c = 7.120 Å, β = 98.086°; Z = 2; 4 nitro groups bonded to Ni by N, 1 by O (–ONO)
|formed by heating monohydrate at 100 °C dark purple; hygroscopic
|[{{cite journal|last1=Green|first1=RW|last2=Bell|first2=B|title=Complex nickel nitrites. I. Complexes of N-substituted Propane-1,3-diamines|journal=Australian Journal of Chemistry|date=1973|volume=26|issue=8|pages=1663|doi=10.1071/CH9731663}}] |
| K4[Ni(NO2)6]·H2O
|potassium hexanitronickelate monohydrate
|hexagonal, a = 7.634 Å, c = 22.45 Å, Z = 3; nitro groups bonded to Ni via N; water not coordinated
|formed from KNO2 and NiCl2 mix in water; orange brown; stable in vacuum
|[{{Cite journal |last1=Grey |first1=Ian E. |last2=Hitchman |first2=Michael A. |last3=Rowbottom |first3=Graham L. |last4=Scarlett |first4=Nicola V. Y. |last5=Wilson |first5=Jenny |date=1994-01-01 |title=Crystal and molecular structure and spectra of K4[Ni(NO2)6]·H2O and K3[Ni(NO2)4(O2N)] |url=https://pubs.rsc.org/en/content/articlelanding/1994/dt/dt9940000595 |journal=Journal of the Chemical Society, Dalton Transactions |language=en |issue=4 |pages=595–601 |doi=10.1039/DT9940000595 |issn=1364-5447|url-access=subscription }}] |
| K2Ca[Ni(NO2)6]
|potassium calcium hexanitronickelate
|cubic, a = 10.31 Å, Z = 4
|buff
|[{{cite journal|last1=Hathaway|first1=B. J.|last2=Slade|first2=R. C.|title=The influence of cations on the properties of the hexanitrometallate anions in the K2MIIMII(NO2)6 type of complex of the nickel(II) and copper(II) ions|journal=Journal of the Chemical Society A: Inorganic, Physical, Theoretical|date=1968|pages=85|doi=10.1039/J19680000085}}] |
| K2Sr[Ni(NO2)6]
|potassium strontium hexanitronickelate
|cubic, a = 10.5063 Å, Z = 4, density = 2.867 g/cm3
|brown yellow
|[{{cite journal|last1=Takagi|first1=S.|last2=Joesten|first2=M. D.|last3=Lenhert|first3=P. G.|title=Potassium strontium hexanitrocuprate(II) and potassium strontium hexanitronickelate(II)|journal=Acta Crystallographica Section B|date=15 August 1976|volume=32|issue=8|pages=2524–2526|doi=10.1107/S0567740876008121|bibcode=1976AcCrB..32.2524T }}] |
| K2Ba[Ni(NO2)6]
|potassium barium hexanitronickelate
|cubic Fm3 (and m3m), a = 10.7800 Å, Z = 4, density = 2.918 g/cm3
|brown yellow
|[{{cite journal|last1=Takagi|first1=S.|last2=Joesten|first2=M. D.|last3=Lenhert|first3=P. G.|title=Potassium barium hexanitronickelate(II)|journal=Acta Crystallographica Section B|date=15 July 1975|volume=31|issue=7|pages=1970–1972|doi=10.1107/S0567740875006590|doi-access=|bibcode=1975AcCrB..31.1970T }}] |
| K2Pb[Ni(NO2)6]
|potassium lead hexanitronickelate
|cubic Fm3, a = 10.577 Å, Z = 4, density = 3.480 g/cm3: No NO2 group disorder
|buff colour
|[{{cite journal|last1=Takagi|first1=S.|last2=Joesten|first2=M. D.|last3=Lenhert|first3=P. G.|title=Potassium lead hexanitronickelate(II)|journal=Acta Crystallographica Section B|date=15 July 1975|volume=31|issue=7|pages=1968–1970|doi=10.1107/S0567740875006589|doi-access=|bibcode=1975AcCrB..31.1968T }}] |
| N(CH3)4[Ni(NO2)3]
|tetramethylammonium nickel nitrite TMNIN
|hexagonal perovskite P{{overline|3}}m1, a = 9.103 Å, c = 7.082 Å, V = 508.2 Å3, Z = 2, density = 1.770 g/cm3; all nitros are bidentate, nickel either links to N or O of the NO2, forming a chain of nickel alternating with ONO
|yellow brown; one-dimensional Heisenberg antiferromagnet; Haldane material; phase transitions at 409.1 and 428.4 K due to rotation of N(CH3)4
|[{{cite journal|last1=Chou|first1=Liang-Kuei|last2=Abboud|first2=Khalil A.|last3=Talham|first3=Daniel R.|last4=Kim|first4=W. W.|last5=Meisel|first5=Mark W.|title=Structure- and Orientation-Dependent Magnetic Susceptibility of Tetramethylammonium Nickel Nitrite, (CH3)4N[Ni(NO2)3]: An S = 1 One-Dimensional Heisenberg Antiferromagnet|journal=Chemistry of Materials|date=November 1994|volume=6|issue=11|pages=2051–2055|doi=10.1021/cm00047a026}}][{{cite journal|last1=Kong|first1=Li-Hui|last2=Fu|first2=Da-Wei|last3=Ye|first3=Qiong|last4=Ye|first4=Heng-Yun|last5=Zhang|first5=Yi|last6=Xiong|first6=Ren-Gen|title=Iso-structural phase transition in tetramethylammonium nickel(II) nitrite [(CH3)4N][Ni(NO2)3]|journal=Chinese Chemical Letters|date=June 2014|volume=25|issue=6|pages=844–848|doi=10.1016/j.cclet.2014.05.028}}] |