Lewis-base adducts of Group 1B metal(I) compounds. Part 17. Synthesis and crystal structures of adducts of copper(I) cyanide with nitrogen bases

Abstract

Compounds of the type [Cu(CN) L,] [L = diethylamine, (1 ), triethylamine, (2), 4-methylpyridine, (3), or 1 ,1 0-phenanthroline, (4)] have been synthesized by recrystallization of copper(i) cyanide from (or with) the parent base and their crystal structures have been determined by single-crystal X-ray diffraction methods; n = 1 except in the case of (3) where n = 1.5. Crystals of (1) are monoclinic, space group P2,/n, with a = 15.1 08(7), b = 7.321 (5), c = 13.699(6) A, p = 103.00(4)", and Z = 8; R was 0.044 for No = 871 independent 'observed' reflections. For (2), crystals are orthorhombic, space group Pnma, with a = 9.501 (4), b = 8.921 (4), c = 11.279(5) A, and Z = 4; R = 0.039, No = 369. For (3), crystals are monoclinic, space group Cc,with a = 9.587(3), b = 16.326(4), c = 14.022(4) A, p = 109.38(2)", and Z = 4; R = 0.031, No = 1 070. For (4), crystals are trigonal, space group P3,, with a = 9.1 75(5), c = 11.753(8) A, and Z = 3; R = 0.041, No = 81 2. All complexes are one-dimensional polymers, that in (2) being disposed completely in a mirror plane except for the substituent alkyl groups. Copper atoms in (1 ) and (2) are trigonally planar co-ordinated by C,N(cyanide) and N(base), as is one of the two copper atoms in (3);the other copper atom in (3) is unusual, being four-co-ordinated pseudo-tetrahedrally by C,N(cyanide) and two N(base). A similar copper environment is found in (4).