The crystal structure of disodium bisoxalatostannate(II), Na₂Sn(C₂O₄)₂

Abstract

The crystal structure of the title compound has been determined from single-crystal X-ray diffraction data by Patterson and Fourier methods. Crystals are monoclinic, space group C2/c with Z= 4 in a unit cell of dimensions a= 10"422 (8), b = 5.676 (4), c= 13.618 (7) A,, fl= 108"50 (5) °. The structure was refined by least-squares methods to R 0.071 for 1193 reflexions. The oxalates are equivalent and are chelated to Sn through one oxygen on each carbon atom to give one Sn-O bond of 2.25 and one of 2.36 A,. The tin atoms are in distorted pyramidal sites surrounded by two oxygen atoms at 2.25 and two at 2.36 A.

Synthesis, Crystal Structures, and Properties of (4,4'‐Hbipy)2[Sn2(C2O4)3] and (4,4'‐Hmbipy)[SnX2] (X = C2O42–, m = 2; X = Cl, m = 0; bipy = bipyridine)

“…There are two short Sn–O bonds of 2.136(2) Å and two slightly longer Sn–O bonds distances of 2.283(2) Å for 2 . The average lengths of Sn–O bond is 2.210 Å, which is close to the average length of Sn 2 (NH 4 ) 2 (C 2 O 4 ) 3 · 3H 2 O, Sn 2 (PO 4 )(C 2 O 4 ) 0.5 , and Na 2 Sn(C 2 O 4 ) 2 . The O–Sn–O bond angles range of 1 is 72.21(5)° to 136.09(6)° and that of 2 is 79.17(8)° to 141.93(10)°, giving the tin atoms a distorted pyramidal environment.…”

“…The O–Sn–O bond angles range of 1 is 72.21(5)° to 136.09(6)° and that of 2 is 79.17(8)° to 141.93(10)°, giving the tin atoms a distorted pyramidal environment. Tin is, as in most of the tin(II) compounds, in a quite distorted coordination environment due to the presence of its lone‐pair, as shown in Figure a and b.…”

Structure of pyridinium catena-μ-chloro-chloro(3,4,5,6-tetrachloropyrocatecholato)antimonate(III)

“…Such lengthening of bonds (Table 3) is a common feature in both Sb-O and Sb-C1 compounds in which the Sb coordination is greater than three. Similar effects have been noted in the structural chemistry of Sn n, which is isoelectronic with Sb m. In Sn H an increase in the metal coordination from the usual trigonal-bipyramidal environment only occurs if at least one of the three short bonds is lengthened (Dewan, Silver, Andrews, Donaldson & Laughlin, 1977;Donaldson, Donoghue & Smith, 1976). In Sn n structures this often leads to four-coordinated environ- …”

The structure of potassium tris(monochloroacetato)stannate(II)

“…The O-Sn-O bond angle in the regular coordination of Ca[Sn(CH3CO2)3] 2 is 83.5 °. Unidentate O atom ligands such as acetate and monochloroacetate appear to favour the formation of three-coordinated triligand stannate(II) species in contrast to chelating ligands which give rise to distorted square-pyramidal Sn H sites with two long and two short Sn-O distances such as those in Na2[Sn(C2Oa) 2] (Donaldson, Donoghue & Smith, 1976) and Sn(C4H204).H20 (Dewan, Silver, Andrews, Donaldson & Laughlin, 1977).…”

“…The crystal structures of only four Sn II carboxylate compounds are known, K[Sn(HCO2) a] (Jelen & Lindqvist, 1969), Na2[Sn(C204) 2] (Donaldson, Donoghue & Smith, 1976), Sn(CaH204).H20 (Dewan, Silver, Andrews, Donaldson & Laughlin, 1977) and Ca[Sn(CHaCO2)3] 2 (Dewan, Silver, Donaldson & Thomas, 1977). We now describe the structure of K[Sn(C1CH2CO2)3].…”