Tetracyanometallates with Complex Dien Cations: [Ni(dien)2][Ni(CN)4]·2H2O and [Ni(dien)2][Pd(CN)4]

Abstract

The crystal structures of two square tetracyanocomplexes were determined. [Ni(dien) 2 ][Ni(CN) 4 ] · 2H 2 O (NDNCH) and [Ni-(dien) 2 ][Pd(CN) 4 ] (NDPC) (dien ϭ diethylene triamine) exhibit ionic structures consisting of mer-[Ni(dien) 2 ] 2ϩ cations and [Ni(CN) 4 ] 2Ϫ or [Pd(CN) 4 ] 2Ϫ anions, respectively. Moreover, the structure of NDNCH is completed by two water molecules of crystallisation. In both compounds hydrogen bonds contribute to the Tetracyanometallate mit komplexen dien-Kationen: [Ni(dien) 2 ][Ni(CN) 4 ] · 2H 2 O und [Ni(dien) 2 ][Pd(CN) 4 ] Inhaltsübersicht. Die Kristallstrukturen zweier quadratisch-planarer Tetracyanokomplexe wurden bestimmt. [Ni(dien) 2 ][Ni(CN) 4 ] · 2H 2 O (NDNCH) and [Ni(dien) 2 ][Pd(CN) 4 ] (NDPC) (dien ϭ Diethylentriamin) zeigen ionische Strukturen, die aus mer-[Ni(dien) 2 ] 2ϩ Kationen und [Ni(CN) 4 ] 2Ϫ bzw. [Pd(CN) 4 ] 2Ϫ Anionen aufgebaut sind. Die Struktur von NDNCH weist darüberhin-

Synthesis and characterisation of a new six-coordinated thermochromic Ni complex

“…The Ni-N(py(CH 2 OH) 2 ) and Ni-O(py(CH 2 OH) 2 ) distances in 2 are normal and are comparable to the distances in [Ni(py(CH 2-OH) 2 )] 2+ that have been reported previously (ranges of 1.968(4)-1.994(3) Å for Ni-N and 2.051(2)-2.151(3) Å for Ni-O) [22,23]. The Ni-N(central N atom in dien) distance and Ni-N(terminal N atom in dien) distance are also normal and are comparable to the distances in [Ni(dien) 2 ] 2+ that have been reported previously (ranges 2.050(5)-2.169(4) Å for Ni-N(centre) and 2.092(4)-2.193(5) Å for Ni-N(terminal)) [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. The py(CH 2 OH) 2 ligands in 2 are not deprotonated; therefore, 2 contains two counter anions (PF 6 À and CF 3 COO À ).…”