Mpms7 system

NMR spectra were collected on a Bruker AV-300 spectrometer. Infrared spectra were obtained using KBr pellets on a PerkinElmer 1600 spectrometer in the 450–4000 cm⁻¹ range. DC magnetic measurements were collected using a Quantum Design MPMS7 system. Samples were restrained with parafilm to prevent torqueing. The magnetic background caused by the gel cap and the parafilm were subtracted by blank measurements. The diamagnetism correction was estimated from Pascal's constant.²² Elemental analyses (C, H, N) and dc magnetic susceptibility measurements were carried by the National Taiwan University Instrument Centre, College of Science. AC magnetic susceptibility data were collected using the Quantum Design MPMS XL7 system of the National Chiao Tung University. Oriented single crystal magnetization hysteresis loops were measured by employing a micro-SQUID array that was described elsewhere.²³ A single crystal was put onto the array and external field is oriented parallel to the crystal easy axis.