ic0c01105_si_001.pdf (440.79 kB)
Synthesis and Characterization of SF4 Adducts with Polycyclic Amines
journal contribution
posted on 2020-05-22, 20:30 authored by Nathan Kostiuk, James T. Goettel, Michael GerkenChalcogen-bonding
interactions of SF4 with the polycyclic
amines DABCO (C6H12N2) and HMTA (C6H12N4) were studied by low-temperature
Raman spectroscopy and X-ray crystallography, revealing the 2:1 adducts
C6H12N2·2SF4 and
C6H12N4·2SF4 obtained
from SF4 solvent. In C6H12N2·2SF4, the sulfur in each SF4 molecule
is pentacoordinate with each SF4 coordinated by a single
amine group, whereas C6H12N4·2SF4 forms a one-dimensional coordination polymer with three of
the four nitrogen atoms in HMTA exhibiting N---S chalcogen bonds:
one terminal N---SF4 and one experimentally unprecedented
bridging N---(SF4)---N moiety. Solvolysis of C6H12N2·2SF4 by HF yielded crystals
of [C6H12N2H]+2F–[SF5]−·6SF4, in which SF4 acts as a chalcogen-bond donor toward
N as well as F. Solvolysis of C6H12N4·2SF4 resulted in the formation of the monoprotonated
HMTA salt [C6H12N4H]+[HF2]−·SF4. Excess HF also led
to isolation of monoprotonated HTMA, as seen in the crystal structure
of the [C6H12N4H]+[H2F3]−·HF salt. The reaction
of bicyclic, monobasic quinuclidine with SF4 and HF gave
[C7H13NH]+F–·3.5SF4, which contains N–H---F–---SF4 interactions, as well as an interstitial, disordered SF4 molecule.