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Di(benzothiazol‐2‐yl)phosphanide as a Janus‐Head Ligand to Caesium
Author(s) -
Stey Thomas,
Pfeiffer Matthias,
Henn Julian,
Pandey Sushil K.,
Stalke Dietmar
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200601221
Subject(s) - chemistry , ligand (biochemistry) , caesium , lone pair , ring (chemistry) , janus , hydrogen bond , ether , metal , solvent , atom (system on chip) , crystallography , medicinal chemistry , inorganic chemistry , molecule , organic chemistry , materials science , nanotechnology , biochemistry , receptor , computer science , embedded system
Starting from tris(benzothiazol‐2‐yl)phosphane ( 1 ) an advanced Janus‐head ligand, di(benzothiazol‐2‐yl)phosphane ( 2 ), was synthesised and structurally characterised. The heteroaryl substituents of this ligand provide both hard and soft donor sites. Surprisingly, the phosphorus atom in 2 is divalent and the hydrogen atom is directly bonded to one ring nitrogen atom and hydrogen bonded to the second. Compound 2 decomposes in any common solvent other than diethyl ether and a new preparation to improve the yields of 2 is presented. A coordination polymer, [{Cs(bth) 2 P} 8 ] ( 3 ) (bth=benzothiazol‐2‐yl), was obtained when the sec ‐phosphane 2 was allowed to react with elemental caesium in a 1:1 ratio in diethyl ether at −78 °C. In 3 each anion is coordinated to four caesium cations and vice versa. The central phosphorus atom is coordinated to two metal atoms above and below the mean plane of the anion in positions in which the two lone pairs of a four‐electron donor are anticipated. Two additional cations μ‐bridge both ring nitrogen atoms. Hence both faces of the Janus‐head ligand are coordinated to the same number of metal cations but in a different way.