Hofmann-H2O-type and Hofmann-H2O-Td-type host structures accomodating 1,4-dioxane: crystal structures of trans-bis (morpholine-N) cadmium(II) tetracyanonickelate(II), trans-diaquacadmium(II) tetracyanonickelate(II)-(1,4-dioxane)() and trans-diaquacadmium(II) tetracyanocadmate(II) (1,4-dioxane)()

Autor: Toschitake Iwamoto, Chong-Hyeak Kim, Takafumi Kitazawa, Hidetaka Yuge
Rok vydání: 1997
Předmět:
Zdroj: Inorganica Chimica Acta. 257:217-224
ISSN: 0020-1693
DOI: 10.1016/s0020-1693(96)05484-9
Popis: In order to stabilise six-membered alicyclic ether guests through a hydrogen bond with an H2O ligand in the host, Hofmann-H2O-type [Cd(H2O)2Ni(CN)4] and Hofmann-H2O-Td-type [Cd(H2O)2Cd(CN)4] hosts were examined for accomodating 1,4-dioxane and morpholine as probable guests. The single crystal structures of the eventually obtained morpholine-ligated complex [Cd(C4H9NO)2Ni(CN)4] (1) and 1,4-dioxane-guest clathrates, [Cd(H2O)2Ni(CN)4]·2C4H8O2 (2) and [Cd(H2O)2Cd(CN)4]·2C4 H8O2 (3), are closely related in topology with previously known [Cd(py)2Ni(CN)4], [Cd(NH3)2Ni(CN)4]·2C4H8O2 and [Cd(NH3)2Cd(CN)4] ·2C6H6, respectively, but involve hydrogen bonds between the morpholine ligands in 1, and between the aqua ligand of the host and the guest 1,4-dioxane in 2 and 3. Complex 1 crystallises in the orthorhombic system, Pmna, a = 7.985(1), b = 6.695(2), c = 14.314(2) A , Z = 2, R = 0.048 for 1240 reflections; clathrate 2: monoclinic, P2/m, a = 7.3980(8), b = 7.6454(6), c = 8.0639(9) A , β = 93.703(9)°, Z = 1, R = 0.041 for 1040; 3: monoclinic, C2/c, a = 12.054(5), b = 11.334(6), c = 15.249(2) A , β = 91.62(2)°, Z = 4, R = 0.043 for 2129. The structure of a Hofmann-H2O-type hydrate [Fe(H2O)2Ni(CN)4]·4H2O, orthorhombic Pnma, a = 12.200(2), b = 14.028(2), c = 7.2327(9) A , Z = 4, R = 0.042 for 710, is also reported.
Databáze: OpenAIRE