Most materials will shrink or expand laterally when stretched or compassed

i. e．they have positive Pnisson ratios

but materials with negative Poisson ratios will undergo lateral expansion when stretched longitudinally and become thinner when compressed．And materials exhibiting this novel and counterintuitive behavior

now known as auxetic materials

have been successfully fabricated with many new applications Currently

molecular auxeties

namely auxetic materials at the molecular level

have become the most exciting endeavor in the development of auxetic materials．In this paper

as new alternatives to the making of molecular auxetics

several typos of centipede- like linear polymem both with single and double legs on the side chain

single-arrow-like

double-arrow-like organic compounds were designed as building blocks for self-assembling into auxetic network structures through hydrogen bonds．The second derivative method is used to cateulate Poisson ratios after doing molecular mechanics (MM) optimization The results show that all these self-assembly networks can be arranged as inverted honey-comb like streetures and their Poisson’s ratios in at least one plane are negative and even the self assembly of small molecules with special architecture may achieve auxeticity in some cases．Compared with many approaches proposed so far．that of the self-assembly of both single polymem and single small molecules into molecular auxetics reported here is quite novel．It provides a new route to synthesize molecular auxetics

which should be much easier than that for synthesizing two-dimensional cross-linked auxetic networks．Yet its successful realization requires great experimental efforts.