Premium
Copper(II) Melonates Cu 3 [C 6 N 7 (NCN) 3 ] 2 ·8H 2 O and [Cu(C 2 H 8 N 2 ) 2 ] 3 [C 6 N 7 (NCN) 3 ] 2 ·4H 2 O – Using the Terminal Cyano Group of the[C 6 N 7 (NCN) 3 ] 3– Ion for Complexation
Author(s) -
Clauss Corinna,
Schmidt Horst,
Schwarzer Anke,
Kroke Edwin
Publication year - 2011
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100224
Subject(s) - copper , triclinic crystal system , chemistry , crystal structure , ethylenediamine , aqueous solution , crystallography , x ray crystallography , inorganic chemistry , diffraction , organic chemistry , physics , optics
Abstract. Copper melonate Cu 3 [C 6 N 7 (NCN) 3 ] 2 · 8H 2 O ( 2a ) was synthesized by a metathesis reaction of potassium melonate with copper(II) in aqueous solution. A related copper melonate [Cu(C 2 H 8 N 2 ) 2 ] 3 [C 6 N 7 (NCN) 3 ] 2 · 4H 2 O ( 2b ) was obtained from an aqueous potassium melonate solution containing copper(II) and ethylenediamine. The crystal structure of 2b was determined by X‐ray diffraction analysis (triclinic, P $\bar{1}$ , a = 6.8035(5), b = 12.6931(8), c = 14.9636(10) Å, α = 67.215(5), β = 79.273(6), γ = 87.206(6)°, V = 1170.17(14) Å 3 ). In contrast to already reported crystal structures of melonates copper ions are coordinated only to the terminal nitrogen atoms of the cyanamide functionality of the melonate anion. Both copper(II) melonates 2a and 2b were further characterized by FT‐IR and 13 C MAS NMR spectroscopy, TG/DTA, and elemental analysis. Whereas dehydrated 2a is stable up to 500 °C, 2b shows less thermal stability.