CsNb3Br7S: Synthese,Struktur und Bindungsverhältnisse

CsNb₃Br₇S: Synthesis, Structure, and Bonding States The reaction of NbBr₅ with Nb, Cs and S in a sealed Nb container affords CsNb₃Br₇S at 800°C (3 days). Further on isotypic compounds of the general formula ANb₃X₇Ch with A = Rb, Cs; X = Cl, Br and Ch = S, Se are obtained. CsNb₃Br₇S crystallizes monoclinic (space group P2₁/a, Z = 2), with the lattice parameters a = 707.4(2), b = 1 888.4(4), c = 994.1(2) pm and β = 98.59(2)°. The crystal structure contains Nb₃ clusters being linked by two additional Nb? Nb bonds to form infinite chains. Adjacent chains are bridged by Cs atoms in a cubeoctahedral coordination sphere of Br atoms. Similar with Nb₃Br₈ seven electrons occupy metal—metal bonding states.