The application of nuclear quadrupole resonance to the study of clathrates. Chlorine-35 NQR and crystallography of clathrated carbon tetrachloride

Structure of the clathrate compound tris(2,4-pentanedionato)iron(III)-trans-1,2-dichloroethene (1/1)

“…(5) 3.6 (7) (2(12) 0.382 (3) 0.0876 (14) 0.0124 (5) 6.4 (10) C_, (13) 0.6134 (19) 0.1525 (13) 0.0699 (5) 4.1 (7) C (14) 0.6962 (18) implies that only weak molecular interactions of the order of van der Waals bonding are present in these clathrate compounds. This result has also been confirmed by a nuclear quadrupole resonance study (Pang, 1989): the resonance frequencies of the trans-CHCI=CHC1 and CC14 guest molecules in the clathrates shift only slightly from that of the pure trans-CHCI~CHC1 and CC14 molecules. The Introduction.…”

“…Tris(acetylacetonato)iron(III), Fe(acac)3, was observed to form 1/2 addition compounds with chloroform molecules over 30 years ago (Steinbach & Bruns, 1958). This chelate complex was recently shown to form clathrate compounds with different small solvent molecules, such as CH2C12, CHCI3, CC14, trans-CHCI~CHC1 and 1,2-CH2C1-CH2CI (Pang, 1989). The Fe(acac)3 complex (I) crystallizes from benzene to give the non-clathrated phase in the space group Pbca (Iball & Morgan, 1967).…”

“…The Fe(acac)3 complex (I) crystallizes from benzene to give the non-clathrated phase in the space group Pbca (Iball & Morgan, 1967). However, an X-ray analysis of Fe(acac)3.-CC14 revealed that the compound has the space group R3 and the host Fe(acac)3 molecule utilizes crystallographic C3 symmetry in construction of the cage, generating trigonal cavities to accommodate the CC14 guest molecule (Pang, Lucken & Bernardinelli, 1990). We report here a crystallographic study of the Fe(acac)3.C2H2C12 clathrate (II) whose structure has not previously been described.…”

Physical Chemistry at the University of Geneva

“…Lucken significantly increased our knowledge in this field by using NQR to study the mobility of small chlorinated molecules trapped in the matrices of inclusion complexes. [7] He also used rotational spectroscopy to determine the precise geometry of molecules in the gaseous phase.…”

trans-Bis(O-ethyl dithiocarbonato-S,S')bis(isoquinoline)nickel(II)

“…Despite this, alkyl xanthate metal complexes, and in particular their crystal structures, have received relatively little attention (Gable, Hoskins & Winter, 1985;Pang, Lucken & Bernardinelli, 1990). Tiekink & Winter (1986) reported the crystal structure of the 1:1 adduct formed between bis(O-ethyl xanthato)nickel(II) and triphenylphosphine.…”