A. Crispini et al., SYNTHETIC AND STRUCTURAL STUDIES ON BISMUTH(III) THIOCYANATE AND SELENOCYANATE COMPLEXES, Journal of the Chemical Society. Dalton transactions, (9), 1994, pp. 1327-1335
The reaction between either BiCl3 or Bi(NO3)3.5H2O and 3 equivalents o
f KSCN afforded a yellow material which has not been fully characteris
ed but which reacts as a source of Bi(SCN)3 A. Compound A and 2 equiva
lents of K[Mo(CO)3(eta-C5H5)] afforded the green complex [Bi(SCN){Mo(C
O)3(eta-C5H5)}2] which has been characterised by X-ray crystallography
and consists of trigonal-pyramidal bismuth centres co-ordinated to on
e SCN group through sulfur, and two Mo(CO)3(eta-C5H5) fragments with a
dditional intermolecular Bi...NCS interactions resulting in a one-dime
nsional polymer. The reaction between A and [K(18-crown-6)]SCN (1 8-cr
own-6 = 1,4,7,10,13,16-hexaoxacyclooctadecane) afforded an orange and
a yellow crystalline material both of which have been characterised by
X-ray crystallography and shown to be isomers. In the orange compound
a potassium cation is located between two potassium cations co-ordina
ted by 18-crown-6 ligands and an octahedral [Bi(SCN)6]3- anion is pres
ent. These ions are organised into two-dimensional sheets in which eac
h [Bi(SCN)6]3- anion is surrounded by four K[K(18-crown-6)]2 units and
vice versa. In the yellow compound the structure has the same basic c
ationic and anionic units but the thiocyanatobismuth anion has four S-
bonded and two trans N-bonded thiocyanate ligands with the anions arra
nged in parallel columns separated (within columns) by potassium catio
ns. The remaining two potassium cations are co-ordinated by 18-crown-6
ether ligands and are positioned between the columns. The reaction be
tween BiCl3 and 3 equivalents of KSeCN afforded dark red crystals of a
complex formulated as Bi(SeCN)3. The reaction between Bi(SeCN)3 and 2
equivalents of [Bi{Mo(CO)3(eta-C5H5)}3] afforded [Bi(SeCN){Mo(CO)3(et
a-C5H5)}2]. The reaction of [N(PPh3)2] [BiCl4] and 4 equivalents of KS
eCN afforded a dark red crystalline compound K[N(PPh3)2]2[Bi(SeCN)6] t
he structure of which was also established by X-ray crystallography an
d comprises isolated [N (PPh3)2]+ cations and columns of [Bi(SeCN)6]3-
anions separated by potassium cations in a similar manner to that fou
nd in yellow K[K(18-crown-6)]2[Bi(SCN)4(NCS)2].