Diorganotin(IV) compounds of types RR′Sn(SeCH
2CH
2pz)
2 [R = R′ =
nBu (
2), Ph (
3); R = 2-(Me
2NCH
2)C
6H
4, R′ = Me (
4),
nBu (
5), Ph (
6)], and RR′SnX(SeCH
2CH
2pz) [R = 2-(Me
2NCH
2)C
6H
4, R′ =
nBu, X = Cl (
7), R′ = Me, X = SCN (
9)], as well as [2-(Me
2NCH
2)C
6H
4](Me)Sn(NCS)
2 (
8), and the tin(II) Sn(SeCH
2CH
2pz)
2 (
10) (pz = pyrazole), were prepared by salt metathesis reactions between the appropriate diorganotin(IV) dichloride or dipseudohalide and Na[SeCH
2CH
2pz], with the latter freshly prepared from (pzCH
2CH
2)
2Se
2 (
1). The solution behaviour of these compounds was investigated by multinuclear NMR (
1H,
13C,
77Se,
119Sn), and the NMR spectra showed the existence of the Se–Sn bonds in solution. Compounds
4 and
5 showed decomposition in a solution of chlorinated solvents with the formation of selenium bridged dimeric species of type {[2-(Me
2NCH
2)C
6H
4](R’)Se}
2 [R′ = Me (
4-a),
nBu (
5-a)], as the single-crystal X-ray diffraction studies revealed, in contrast with compound
9, for which a monomeric structure was observed with the desired composition. The solid state structures of
4-a,
5-a,
8, and
9 revealed N→Sn intramolecular coordination of the nitrogen atom in the pendant CH
2NMe
2 arm. The NMR spectra suggested such a coordination at room temperature only for compound
7.
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