Chiral self-assembly of methyltin(IV)-naproxenates: Combining dative Sn-O bonds, secondary Sn⋯O interactions and C-H⋯O hydrogen bonding to make an inter-helical meander-shaped network and a cross-linked Z-shaped ribbon

New chiral organotin(IV) carboxylates, Me2Sn(nap)2 (1), {[Me2Sn(nap)]2O}2 (2) and Me3Sn(nap) (3) (nap = (S)-(+)-6-methoxy-α-methyl-2-naphthaleneaceto anion) have been synthesized. All of them have been characterized by elemental analysis, multinuclear (1H, 13C and 119Sn) NMR and IR spectroscopy. The crystal structures of 1 and 2 have been determined by X-ray diffraction analysis.