Naslov
Crystal and molecular structure of bis(pyridine)bis(saccharinato)-mercury(II), [Hg(py)_2(sac)_2]

Autori
Jovanovski, Gligor ; Naumov, Panče ; Kaitner, Branko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
8th Croatian-Slovenian Crystallographic Meeting Book of Abstracts and Programme / Danilovski, Aleksandar ; Kajfež, Tanja ; Popović, Stanko - Zagreb : Pliva, 1999

Skup
8th Croatian-Slovenian Crystallographic Meeting

Mjesto i datum
Rovinj, Hrvatska, 17.06.1999. - 19.06.1999

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Metal saccharinates; mercury(II) compounds; X-ray structure determination

Sažetak
Within our extensive research of the structural properties of saccharinato salts and complexes, the crystal structures of Hg(sac)_2 (1) [B. Kamenar et al., Cryst. Struct. Comm., 11 (1982) 263], HgCl(sac) (2) [G. Jovanovski et al., Acta Cryst., C44 (1988) 616] and Hg(bpy)(sac)_2 (3) [A. Hergold-Brundić et al., Acta Cryst., C45 (1989) 556] were previously reported. Our recent attempts to synthesize a pyridine adduct of mercury(II) saccharinate using HgCl_2 yielded the complex [HgCl(py)(sac)]_2 (4) [O. Grupče et al., Croat. Chem. Acta, 72, No. 2 (1999) in press]. The use of Hg(OAc)_2, however, gave the expected pyridine adduct, bis(pyridine)bis(saccharinato)mercury(II) (5), whose crystal and molecular structure is reported here. Crystal data. C_24H_18HgN_4O_6S_2, triclinic, P-1, M_r = 723.13, a = 10.1763(7), b = 10.2652(8), c = 12.7153(10) A, a = 101.734(7), b = 95.528(9), c = 94.389(9) ^o, V = 1288.15(17) A^3, D_c= 1.864 gˇcm^-^3, Z = 2, l(MoK_a) = 0.71073 A, R = 0.118, wR = 0.163 for 4004 reflections with Inet * 2sInet out of 5593 independent intensity data. (based on the non-absorption correction data; the refinement is in progress). The structure consists of discrete [Hg(py)_2(sac)_2] molecules. Mercury atom is in the general position, being tetrahedrally coordinated by two pyridine as well as two saccharinato nitrogen atoms. The value of the dihedral angle between the planes of the pyridine rings is 103.0(16)^o, while that between the saccharinato ligands amounts 59.6(6)^o. The Hg-N(py) distances in 5 [2.30(3) and 2.34(3) A] are larger than that in 4 [2.021(8) A], but very similar to the Hg-N(bpy) distances in 3 [2.328(4) and 2.393(3) A]. The Hg-N(sac) bond lengths in 5 [2.156(24) and 2.148(22) A], as well as in the other tetrahedral mercury(II) saccharinato adducts, 3 [2.141(4) and 2.120(4) A] and 4 [2.106(7) A], are all longer than the corresponding bonds in the digonal compounds 1 [2.03(1), 2.04(2), 2.05(2) and 2.06(1) A] and 2 [2.021(8) A]. No other interactions, but the usual van der Waals contacts, were observed among the individual molecules.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA