Four new alkali metal copper chlor-tellurites, [Cs(NH₄)]_layer[Cu₄Te₂O₆Cl₆]_layer (I), [Rb₃(NH₄)₂(OH)_0.5]_layer[Cu₁₂Te₆Cl_16.5O₁₈]_layer (II), [K(NH₄)]_layer[Cu₄Te₂O₆Cl₆]_layer (III) and [NaCl]_layer[Cu₄Te₂O₆Cl₄]_layer (IV), have been synthesized via hydrothermal reactions using mixtures of AF (A = Cs, Rb, K, Na), CuCl₂·2H₂O, TeO₂, and hydrazine monohydrate. They have two-dimensional (2D)-layered [Cu₄Te₂Cl_5+x–yO₆]_∞ (x = 0, 2/3, 1; y = 0, 1/6) structures that are separated by different layers comprised of various cations and anions, including A⁺, NH⁴⁺ Cl⁻ OH⁻, etc. The blocks feature S-shaped _∞[Cu₂O₃Cl_3−x] chains linked by TeO₃ trigonal pyramids. The magnetic susceptibility shows a broad maximum at 220 K for I and 240 K for III, which is well simulated by using an alternating antiferromagnetic chain model. The J₂/J₁ ratio within the alternating chain is estimated to be 0.60(1), and the spin gaps are refined to be 152 K for I and 136 K for III.

中文翻译：

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一维碱金属铜氯碲酸盐A（NH4）Cu4Te2O6Cl6（A = K，Cs），NaCu4Te2Cl5O6和Rb3（NH4）2Cu12Te6Cl16.5O18（OH）0.5的合成，晶体结构和磁性。

四种新的碱金属铜-氯碲酸盐，[Cs（NH ₄）]_层[Cu ₄ Te ₂ O ₆ Cl ₆ ]_层（I），[Rb ₃（NH ₄）₂（OH）_0.5 ]_层[Cu ₁₂ Te ₆ Cl _16.5 O ₁₈ ]_层（II），[K（NH ₄）]_层[Cu ₄ Te ₂ O ₆ Cl ₆ ]_层（III）和[NaCl]_层[Cu ₄ Te ₂ O ₆ Cl ₄ ]_层（IV），是使用AF（A = Cs，Rb，K，Na），CuCl ₂ ·2H ₂ O的混合物通过水热反应合成的，TeO ₂和一水合肼。它们具有二维（2D）层[Cu ₄ Te ₂ Cl _{5+ x – y} O ₆ ] _∞（x = 0，2/3，1; y= 0，1/6）由由各种阳离子和阴离子，包括A的不同的层分离结构⁺，NH ⁴⁺氯^- OH ^- ，等等。这些块具有通过TeO ₃三角金字塔链接的S形_∞ [Cu ₂ O ₃ Cl _{3− x} ]链。磁化率在I处为220 K，III处为240 K时显示出极大的最大值，这可以通过使用交替的反铁磁链模型很好地模拟。所述Ĵ ₂ / Ĵ ₁交替链中的比率估计为0.60（1），I的自旋间隙细化为152 K，III的自旋间隙细化为136K。