LEWIS-BASE ADDUCTS OF LEAD(II) COMPOUNDS .16. SYNTHETIC AND STRUCTURAL STUDIES OF SOME ADDUCTS OF 2-AMINOMETHYLPYRIDINE WITH LEAD(II) COMPOUNDS

Syntheses and room-temperature single-crystal X-ray structure determin ations are recorded for 2:1 adducts of 2-aminomethylpyridine ('amp') w ith lead(II) nitrate and thiocyanate. [(amp)(2)Pb(NO3)(2)](2) is tricl inic, <P(1)over bar>, a 11.616(4), b 11.145(6), c 7.341(3) Angstrom, a lpha 83.87(4), beta 89.17(3), gamma 64.12(3)degrees, Z = 1 dimer, R wa s 0.043 for N-o 3529 independent 'observed' (I > 3 sigma(I)) reflectio ns. [(amp)(2)Pb(SCN)(2)](2) is also triclinic, <P(1)over bar>, a 12.12 1(9), b 9.301(14), c 8.615(8) Angstrom, alpha 70.11(10), beta 84.00(7) , gamma 79.38(10)degrees, Z = 1 dimer (R 0.033 for N-o 3467). Both com plexes are centrosymmetric dimers, the coordination environment is mad e up in each cas of a pair of N,N'-bidentate bases, one terminally bou nd anion (O,O'-chelating nitrate or S-bonded thiocyanate) and bridging anions. In the case of the thiocyanates, these bridge end-on, so that the lead(II) environment is seven-coordinate PbN5S2; in the nitrate, the anion chelates through two of its oxygen atoms, bridging via the t hird, so that the lead(II) environment is nine-coordinate (PbN4O5. A ' problem structure', [(amp)(2)Pb(ClO4)(2)], monoclinic, C2/c (?), a 14. 528(3), b 8.203(3), c 15.495(6) Angstrom, beta 91.14(3)degrees, Z = 4 f.u., R 0.044 for N-o 1775, is also recorded, the crystal seemingly a disordered aggregate of [(N,N'-amp)(2)Pb(OClO3)(2)] moieties.