Synthesis and structure of coordination polymer compounds of AgReO4 and AgPF6 with piperazine

• Published in: Russian journal of inorganic chemistry Vol. 56; no. 11; pp. 1733 - 1738
• Main Authors: Kokunov, Yu. V., Gorbunova, Yu. E., Kovalev, V. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-11-2011
• Subjects: Cationic; Chains (polymeric); Chemistry; Chemistry and Materials Science; Coordination Compounds; Coordination polymers; Crystals; Distortion; Inorganic Chemistry; Inversions; Ligands; Silver; Inversion Center; Silver Atom; Zigzag Chain; Coordination Polymer; Piperazine
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023611110155

Coordination polymers [Ag(C
4
H
10
N
2
)]ReO
4
(
I
) and [Ag(C
4
H
10
N
2
)]PF
6
(II) (C
4
H
10
N
2
is piperazine, Ppz) were synthesized and their structures were determined. Crystals of compound
I
are monoclinic, space group
P
2
1
/
c
,
a
= 6.207(1) Å,
b
= 12.533(1) Å,
c
= 11.386(1) Å, β = 93.41(1)°,
V
= 884.2(2) Å
3
, ρ
calc
= 3.337 g/cm
3
,
Z
= 4. Crystals of
II
are monoclinic, space group
C
2/
m
,
a
= 8.723(1) Å,
b
= 9.083(1) Å,
c
= 5.797(1) Å, β = 95.07(1)°,
V
= 457.5(1) Å
3
, ρ
calc
= 2.548 g/cm
3
,
Z
= 2. Structure
I
contains polymer chains [Ag(Ppz)]
∞
+
. The silver atom is linked with two nitrogen atoms of the adjacent Ppz ligands to form a nearly linear fragment; the Ag-N
av
distance is 2.173 Å, and the NAgN angle is 169.4(3)°. The chains are linked with each other by weak interactions Ag…O(ReO
4
) (2.643(8) Å) and N-H…O hydrogen bonds. The structure of compound
II
also contains cationic polymer chains [Ag(Ppz)]
∞
+
. The Ag
+
ion is located in the inversion center and has a linear coordination (Ag-N distance is 2.171(9) Å). The central P atom of the octahedral fluorophos-phate ion is also located in the inversion center; the anion is slightly distorted and has no contacts with silver ions at a distance <3.4 Å.