Synthesis and Structure of a S₄Si₄ Cage Compound

Abstract

The reaction of the tetraaminodisilane R2Si2(NH2)4 (R = CH(SiMe3)2) with liquid H2S at −70 °C resulted in the formation of a R4S4Si4 cage. The core of the molecule consists of four five-membered rings. Two disilane units are bridged cross over by four sulfur atoms. This is a new structural type in the group of silicon−sulfur ring and cluster compounds.

The Chemistry of Aluminum(I), Silicon(II), and Germanium(II)

“…They are basic and versatile reagents in organic chemistry. Because of this, the study of heavier group 14 hydroxides gains importance. , Though various silanols are known, compounds of the type RSi(OH) 3 suffer from various disadvantages such as low chemical stability and poor solubility. ,, We have prepared a stable and soluble aminosilanetriol, 2,6- i -Pr 2 C 6 H 3 N(SiMe 3 )Si(OH) 3 , , and used it as a synthon to assemble a plethora of metallosiloxanes with high metal to silicon ratio. , Hydroxides of germanium are known but are few in number. Some examples are Ph 3 GeOH, (C 10 H 7 ) 3 GeOH, (C 6 H 11 ) 3 GeOH, t -Bu 2 Ge(OH) 2 , 2 t -Bu 2 Ge(OH) 2 ·( t -Bu 2 GeOH) 2 O·H 2 O, [CpFe(η 5 -C 5 H 4 )( t -Bu)(OH)Ge] 2 O, and (FcN) 3 GeOH (FcN = CpFe[η 5 -C 5 H 3 (CH 2 NMe 2 )-2]).…”

“…This has been achieved through various ligand systems that are either monoanionic or dianionic . Owing to our continuing interest in the chemistry of aluminum, silicon, and germanium, in recent years we are probing their subvalent chemistry as well. Our findings pertaining to Al(I), Si(II), and Ge(II) chemistry are discussed in this account, and we mention also very closely related results of other research groups.…”

5 Carbon, silicon, germanium, tin and lead

“…57 The reaction of H 2 S with tetraaminodisilane yields the cage complex 16, structurally similar to the known germanium compound. 58 Linked dimeric thiosquarate ligand 17 forms complexes with lead that show in the solid state a superpositioning of the component cyclic dimeric units assembled into chain-like polymers by bridging interactions of the lead. 59 The rather unusual lead thiophosphate anion [Pb 3 (PS 4 ) 4 ] 6Ϫ has been isolated from a molten polythiophosphate reaction as its sodium salt.…”