The synthesis and isolation of low coordinate methylenebis-(N-DIPP-imidazole-2-ylidene)iron^(II)hydrides, ((^DIPPC)₂CH₂)FeH_2-yI_y ((DIPP = 2,6-di-isopropylphenyl, y = 1 or 0), was complicated by competitive reactions with solvent, rapid reductive elimination of H₂ and/or dissociation of the bis-N-heterocyclic carbene ligand. Addition of KH to ((^DIPPC)₂CH₂)FeI₂ in THF/haloalkane mixtures enabled a short lived mono-hydride to be trapped by reaction with CH₂Cl₂ or cyclo-heptylbromide to form ((^DIPPC)₂CH₂)FeI(X) (X = Cl or Br, respectively). Toluene coordination stabilises iron-mono hydride complexes as ((^DIPPC)₂CH₂)Fe^IIH{η⁶-(toluene)} species, which can be isolated in low yield from combination of borohydride salts and ((^DIPPC)₂CH₂)FeI₂ in toluene, including an imidazole C4 deprotonated carbene-borane, methylene(N-DIPP-imidazole-2-ylidene)(N-DIPP-4-triethyl-borane-imidazole-2-ylidene)](hydrido)(η⁶-toluene)iron. In the absence of toluene, or at short reaction times compounds with empirical formula ((^DIPPC)₂CH₂)Fe(H)(HB(R)₃)·LiI (R = Et or sec-Bu) that function as a masked Fe^(II)-dihydride are isolated. Whilst ((^DIPPC)₂CH₂)Fe(H)(HB(R)₃)·LiI was stable for days in Et₂O, more polar solvents (MeCN, THF) led to formation of the carbene borane adducts ((^DIPPC)₂CH₂)(BR₃)₂. The addition of CO or cyclo-heptylbromide to ((^DIPPC)₂CH₂)Fe(H)(HB(R)₃)·LiI formed ((^DIPPC)₂CH₂)Fe(CO)₃ and ((^DIPPC)₂CH₂)FeBr₂, respectively with BR₃ evolved from both reactions as a by-product.