The hydrothermal reaction of Cu（CH3COO）2·H2O, H3BO3, ethylenediamine and H2O in a molar ratio of 3 ： 20 ： 9 ： 222 at 140 ℃ for 5 d yields the deep blue crystals of a new copper polyborate [Cu（en）2B（OH）3...The hydrothermal reaction of Cu（CH3COO）2·H2O, H3BO3, ethylenediamine and H2O in a molar ratio of 3 ： 20 ： 9 ： 222 at 140 ℃ for 5 d yields the deep blue crystals of a new copper polyborate [Cu（en）2B（OH）3], [B5O5（OH）7] （en=H2NCH2CH2NH2） in 70% yield. It crystallizes in monoclinic system, space group P21/c, with unit cell dimensions, a=1.2779（2） nm, b=1.0167（15） nm, c=1.5019（2） nm, β=90.30（2）°, Z=4. The crystal structure of this compound consists of [Cu（en）2B（OH）3]2＋ cation and [BsOs（OH）7]2- anion, which are linked together through hydrogen bonding interactions and electrostatic forces, forming an interesting three-dimensional framework. The [BsOs（OH）7]2- anion is constituted of [BaOs（OH）4]2- anion and discrete B（OH）3 group which attaches to the side of [B4O5（OH）4]2 through intramolecular hydrogen bonds. Fundamental vibrational modes of this compound were identified and band assignments were made. The middle bands observed at 882 and 575 cm J in Raman spectrum are the characteristic peak of B（OH）3 group and [B4O5（OH）4]2- anion, respectively. Additionally the thermal behavior of title compound was recorded and its decomposition mechanism was discussed.展开更多
文摘The hydrothermal reaction of Cu（CH3COO）2·H2O, H3BO3, ethylenediamine and H2O in a molar ratio of 3 ： 20 ： 9 ： 222 at 140 ℃ for 5 d yields the deep blue crystals of a new copper polyborate [Cu（en）2B（OH）3], [B5O5（OH）7] （en=H2NCH2CH2NH2） in 70% yield. It crystallizes in monoclinic system, space group P21/c, with unit cell dimensions, a=1.2779（2） nm, b=1.0167（15） nm, c=1.5019（2） nm, β=90.30（2）°, Z=4. The crystal structure of this compound consists of [Cu（en）2B（OH）3]2＋ cation and [BsOs（OH）7]2- anion, which are linked together through hydrogen bonding interactions and electrostatic forces, forming an interesting three-dimensional framework. The [BsOs（OH）7]2- anion is constituted of [BaOs（OH）4]2- anion and discrete B（OH）3 group which attaches to the side of [B4O5（OH）4]2 through intramolecular hydrogen bonds. Fundamental vibrational modes of this compound were identified and band assignments were made. The middle bands observed at 882 and 575 cm J in Raman spectrum are the characteristic peak of B（OH）3 group and [B4O5（OH）4]2- anion, respectively. Additionally the thermal behavior of title compound was recorded and its decomposition mechanism was discussed.
