Metathetic synthesis of lead cyanamide as a p-type semiconductor

Abstract

Lead cyanamide PbNCN was synthesized by solid-state metathesis between PbCl2 and Na2NCN in a 1:1 molar ratio, and its structure was confirmed from Rietveld refinement of X-ray data. Electronic-structure calculations...

Metathesis and Redetermination of the Crystal Structure of Cadmium Carbodiimide, CdNCN

“…That being said, the vibrational character observed in CdNCN and MgNCN resembles the one of carbon dioxide, O=C=O, which also contains an inversion center [23,24] . In sharp contrast to that, neither CdNCN nor MgNCN give evidence for a ν s symmetric stretching vibration because such is IR‐forbidden for D ∞ h carbodiimides but not for cyanamides like PbNCN [16,25,26] . For the latter, this ν s vibration is observed around 1250 cm −1 , as also depicted in Figure 3, thereby highlighting the difference in chemical character and anionic shape.…”

“…If the crystallographic description of CdNCN as suggested by Baldinozzi et al were true, a model including discrete single (1.04(4) Å) and triple (1.36(4) Å) CÀ N bonds, one would anticipate a clear ν s mode in the IR and also ν as and δ modes in the Raman data, [22] as not only seen in PbNCN but also in HgNCN(II) and A 2 MnSn 2 (NCN) 6 (A=Li, Na) which display similar degrees of cyanamide character. [25,26,27] That is not the case, so one may rule out that model based on both XRD and spectroscopy.…”

Metal Cyanamides/Carbodiimides: Structure, Synthesis and Electrochemical Energy Storage Performance

“…(1)碱金属离子交换法 该方法以 s 区碱金属或 ds 区过渡金属氰胺化 合物(Li2NCN、Na2NCN 和 ZnNCN)为反应物， 高温下通过与金属卤化物进行阳离子交换获得其 它金属氰胺化合物。Löber 等 [24] 通过 Li2NCN 与 SnCl2/SnF2 在 Ar 气氛中反应，在 450 ℃制备出 SnNCN。Srinivasan [37] 和 Neukirch 等 [38] 通过 LnCl3 (Ln=La，Ce，Pr)和 Li2NCN 的混合物在 600 ℃下 反应制备了 系 列 多 阴 离 子 稀土氰胺化合物 Ln(NCN)Cl 。 Dronskowski 等 [39] 将 PbCl2 和 Na2NCN 按摩尔比反应得到单相多晶 PbNCN，反 应方程式为：…”

Synthesis and characterisation of the quaternary cyanamide Li2MgSn2(NCN)6

“…Salt-like compounds containing extended pseudochalcogenide NCN 2À anions, adopting either the highly symmetric carbodiimide À N=C=N À form with D 1h symmetry [1,2] or the less symmetrical cyanamide N�CÀ N 2À form, [3,4] have been known since the preparation of calcium carbodiimide, CaNCN, as early as 1895. [2] More recently, a growing family of MNCN (M = Mg, Ca, Sr, Mn, Fe, Co, Ni and Cu) [1,2,5,6] and M 2 (NCN) 3 (M = Cr, Sc and Yb) [7][8][9] binaries have been reported which are all characterized by alternating layers of metal cations and NCN 2À anions.…”