In:
Chemistry – A European Journal, Wiley, Vol. 11, No. 1 ( 2005-01), p. 398-405
Abstract:
The reaction of dinuclear copper( II ) cryptates with calcium cyanamide, CaNCN, and sodium dicyanamide, Na[N(CN) 2 ] results in dinuclear compounds of formulae [Cu 2 (HNCN)(R3Bm)](ClO 4 ) 3 ( 1 ), [Cu 2 (dca)(R3Bm)](ClO 4 ) 3 ⋅4H 2 O ( 2 ), and [Cu 2 (NCNCONH 2 )(R3Bm)](CF 3 SO 3 ) 3 ( 3 ), in which R3Bm=N[(CH 2 ) 2 NHCH 2 (C 6 H 4 ‐ m )CH 2 NH(CH 2 ) 2 ] 3 N and dca=dicyanamido ligand (NCNCN − ). The X‐ray diffraction analysis reveals for both 1 and 3 a dinuclear entity in which the copper atoms are bridged by means of the ‐NCN‐ unit. The molar magnetic susceptibility measurements of 1–3 in the 2–300 K range indicate ferromagnetic coupling. The calculated J values, by using theoretical methods based on density functional theory (DFT) are in excellent agreement with the experimental data. Catalytic hydration of a nitrile to an amide functional group is assumed responsible for the formation of 3 from a μ 1,3 ‐dicyanamido ligand.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.200400620
Language:
English
Publisher:
Wiley
Publication Date:
2005
detail.hit.zdb_id:
1478547-X
Bookmarklink