Dalton communications. Crystal structure of [Na·3thf][Fe(CO) 3 (SePh) 3 ] and [N(PPh 3 ) 2 ][Fe(CO) 3 (SePh) 3 ]·0.5thf (thf = tetrahydrofuran): evidence for Na + ⋯ sePh and long-range Na + ⋯ Fe II interactions

The reaction between Na[HFe(CO)4] and (PhSe)2 Yielded Na[Fe(CO)3(SePh)3] which crystallized as [Na·3thf][Fe(CO)3(SePh)3] in which three tetrahydrofuran (thf) molecules and the [Fe(CO)3(SePh)3]– anion surround the sodium cation; in the corresponding crystal structure of [N(PPh3)2][Fe(CO)3-(SePh)3]·0.5thf the cations and anions are discrete entities.