Investigations of the Copper Bromide–Ethylenediamine System: The Hydrothermal Synthesis and X-Ray Crystal Structure of [Cu(H2NCH2CH2NH2)2] [{Cu2Br4}] and [Cu(H2NCH2CH2NH2)2] [{Cu5Br7}]

✍ Scribed by Robert P. Hammond; Douglas J. Chesnut; Jon A. Zubieta

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 429 KB
• Volume: 158
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.9056

✦ Synopsis

The hydrothermal reactions of CuBr 2 , CuBr, and ethylenediamine have resulted in the synthesis of two new compounds. [Cu(H 2 NCH 2 CH 2 NH 2 ) 2 ] [{Cu 2 Br 4 }] has a two-dimensional sheet structure while [Cu(H 2 NCH 2 CH 2 NH 2 ) 2 ] [{Cu 5 Br 7 }] crystallizes as a three-dimensional network. Both compounds were characterized by single-crystal X-ray di4raction. The following are the crystal data for [Cu(H 2 NCH 2 CH 2 NH 2 ) 2 ] [{Cu 2 Br 4 }] (1), triclinic space group P1 (No. 1) with a ‫؍‬ 6.491(1) A s , b ‫؍‬ 8.012(2) A s , c ‫؍‬ 8.070(2) A s , ‫؍‬ 107.713(5)3, ‫؍‬ 109.976(4)3, ‫؍‬ 96.815(4)3, Z ‫؍‬ 1, d calc ‫؍‬ 2.88 g cm ؊3 , and wR2 (R1) ‫؍‬ 0.093(0.037), and [Cu(H 2 NCH 2 CH 2 NH 2 ) 2 ] [{Cu 5 Br 7 }] (2), orthorhombic space group Pnma (No. 62), with a ‫؍‬ 12.886(4) A s , b ‫؍‬ 16.776(5) A s , c ‫؍‬ 9.170(3) A s , Z ‫؍‬ 4, d calc ‫؍‬ 3.55 g cm ؊3 , and wR2 (R1) ‫؍‬ 0.099 (0.073). Both structures consist of anionic one-dimensional copper(I) bromide chains interspersed with cationic [Cu(H 2 NCH 2 CH 2 NH 2 ) 2 ] 2؉ units.