Synthesis of Two Heterobimetallic Cluster Isomers [(η5-C5Me5)2Mo2(μ3-S)3S(CuI)2] and [(η5-C5Me5)2Mo2(μ3-S)4(CuI)2] from trans-[(η5-C5Me5)2Mo2(μ-S)2S2] and Their trans-to-cis Isomerization, Structures, and Third-Order NLO Properties

High switchable dielectric phase transition originating from distortion in inorganic–organic hybrid materials (H2dabco-C2H5) [MIICl4] (M = Co, Zn)

Two phase transition materials (H₂dabco-C₂H₅)[ZnCl₄] and (H₂dabco-C₂H₅)[CoCl₄] were synthesized and characterized.

Tungsten(VI)-Copper(I)-Sulfur Cluster-Supported Metal-Organic Frameworks Bridged by in Situ Click-Formed Tetrazolate Ligands

Six analogous two-dimensional (2D) [Tp*WS₃Cu₃]-based (Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate) networks, namely, {[(Tp*WS₃Cu₃)₂L₃](μ₃-N₃)}_n (2: L = 5-methyltetrazolate (Mtta); 3a: L = 5-ethyltetrazolate (Etta)) and {[(Tp*WS₃Cu₃)₂L₃]BF₄}_n (3b: L = Etta; 4: L = 5-propyltetrazolate (Ptta); 5: L = 5-butyltetrazolate (Btta); 6: L = 5-pentyltetrazolate (Petta)) were synthesized by reactions of [Et₄N][Tp*WS₃] (1), [Cu(CH₃CN)₄]BF₄, NaN₃, and NH₄BF₄ in different nitrile solvents (CH₃(CH₂)_nCN, n = 0, 1, 2, 3, and 4) under solvothermal conditions. In the structures of 2-6, each alkyl tetrazolate L as a bridging ligand was generated in situ from the "click" reaction between azide and nitrile. These 2D (6,3) networks support two types of voids wherein the pendant alkyl groups are accommodated. A tetrahedron cage-like cluster [Tp*W(μ₃-S)₃(μ₃-S')Cu₃]₄ (7) was also formed in some of the above reactions and can be readily separated by solvent extraction. The proportion of 7 increased with the elongation of the alkyl chains and finally became the exclusive product when heptylnitrile was employed. Further use of CuCN as a surrogate for [Cu(CH₃CN)₄]BF₄ with the aim of introducing additional CN bridges into the network led us to isolate a tetrazolate-free compound, {[Et₄N]{(Tp*WS₃Cu₃)[Cu₂(CN)_4.5]}₂·2PhCH₂CN}_n (8·2PhCH₂CN), a unique 2D network that features {(Tp*WS₃Cu₃)[Cu₂(CN)₅]}₂^2-, {(Tp*WS₃Cu₃)₃[Cu₃(CN)₇]₂[Cu(CN)₃]}^4-, and {(Tp*WS₃Cu₃)[Cu₄(CN)₉]}₂^6- ring subunits. Compounds 5-8 are soluble in DMF and exhibit a reverse saturable absorption and self-focusing third-order nonlinear optical (NLO) effect at 532 nm with hyperpolarizability γ values in the range of 4.43 × 10^-30 to 5.40 × 10^-30 esu, which are 400-500 times larger than that of their precursor 1. The results provide an interesting insight into the synergetic synthetic strategy related to the assembly of the [Tp*WS₃Cu₃]²⁺ cluster core, the "click" formation of the tetrazolate ligands, and the construction of the [Tp*WS₃Cu₃]²⁺ cluster-based 2D networks.

A tetra-silver(I)ditungsten(VI) cluster with sulfide and bis-(diphenyl-phosphino)methane ligands

The asymmetric unit of the title complex, [Ag₄W₂S₈(C₂₅H₂₂P₂)₃]·2C₃H₇NO, tris­[μ₂-bis­(diphenyl­phosphino)meth­ane]-3:6κ²P:P′;4:5κ²P:P′;5:6κ²P:P′-μ₅-sulfido-2:3:4:5:6κ⁵S-μ₃-sulfido-1:3:4κ³S-tetra-μ₂-sulfido-1:3κ²S;1:4κ²S;2:5κ²S;2:6κ²S-disulfido-1κS,2κS-tetra­silver(I)ditungsten(VI) N,N-dimethyl­formamide disolvate, contains two [WS₄]²⁻ anions, four silver cations, three bidentate–bridging bis­(diphenyl­phosphino)methane (dppm) ligands and two N,N-dimethyl­formamide (DMF) solvent mol­ecules. The coordination geometry of each Ag atom is distorted tetra­hedral. Two Ag ions are coordinated by μ₂-S and μ₅-S atoms, and by two P atoms from two dppm ligands, while the other two Ag atoms are coordinated by μ₂-S, μ₃-S and μ₅-S atoms, and by one P atom from a dppm ligand.