Red-orange, transparent single crystals of Yb2[CN2]3 [trigonal, R3̄c (no. 167), a = 630.02(3) and c = 2947.4(2) pm, Z = 6] are obtained by the reaction of Yb, Sn, Zn[CN2] and NaN3 in arc-welded Nb ampoules at 1100 K. The title compound exhibits characteristic C-N bond lengths and angles [d(C-N) = 122.7(3) pm and ∡(N-C-N) = 178.4(5)°, respectively] within the [N=C=N]2− unit as well as the expected fundamental frequencies in its optical spectra (Raman: νs = 1338; δ = 643 / 683 / 695 cm−1; IR: νas = 2005 / 2037; δ = 640 / 679 cm−1). Since Yb2[CN2]3 adopts a corundum-type structure, Yb3+ is octahedrally coordinated by six N atoms of different [CN2]2− anions [d(Yb-N) = 228.6(3) and 233.4(3) pm, 3× each] and every [CN2]2− group has four Yb3+ as next neighbours which form a distorted tetrahedron.
通过在1100K下使用电弧焊接的Nb安瓿,在Yb、Sn、Zn[CN2]和NaN3的反应下,得到了Yb2[CN2]3的红橙色透明单晶体[三方晶系,R3̄c(编号167),a = 630.02(3) 和 c = 2947.4(2) pm,Z = 6]。该化合物的[N=C=N]2−单元内具有特征性的C-N键长和角度[d(C-N) = 122.7(3) pm和∡(N-C-N) = 178.4(5)°,分别],并且在其光谱中具有预期的基本频率(拉曼:νs = 1338;δ = 643/683/695 cm−1;红外:νas = 2005/2037;δ = 640/679 cm−1)。由于Yb2[CN2]3采用刚玉型结构,因此Yb3+由不同[CN2]2−阴离子的六个N原子[每个d(Yb-N) = 228.6(3)和233.4(3) pm,各3次]八面体配位,并且每个[CN2]2−团有四个Yb3+作为相邻的邻居,形成扭曲的四面体。