Bailey Mark S, Obrovac Mark N, Baillet Emilie, Reynolds Thomas K, Zax David B, DiSalvo Francis J
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Inorg Chem. 2003 Sep 8;42(18):5572-8. doi: 10.1021/ic0343206.
The novel quaternary nitride-hydride Ca(6)[Cr(2)N(6)]H was synthesized at 1000 degrees C in sealed niobium or stainless steel tubes. It crystallizes in the space group R3 (No. 148, Z = 3) with lattice constants (A) a = 9.0042(2) and c = 9.1898(3) and contains the complex anion Cr(2)N(6)(-) with a short chromium-chromium bond length of 2.26 A. To our knowledge, this is the first example of a non-nitrogen-bridged chromium-chromium dimer in an extended structure compound. Magnetic susceptibility measurements reveal the compound to be paramagnetic at room temperature and with a broad antiferromagnetic ordering centered around 55 K.
新型四元氮氢化物Ca(6)[Cr(2)N(6)]H是在1000℃下于密封的铌管或不锈钢管中合成的。它结晶于空间群R3（编号148，Z = 3），晶格常数a = 9.0042(2)，c = 9.1898(3)，并包含复合阴离子Cr(2)N(6)(-)，其铬 - 铬键长较短，为2.26 Å。据我们所知，这是扩展结构化合物中首个非氮桥连铬 - 铬二聚体的例子。磁化率测量表明，该化合物在室温下呈顺磁性，在55 K左右有一个宽泛的反铁磁有序中心。
